docs: add spell-checker to contributing docs

docs-new/docs/contribute/docs/spell-check.md

@@ -0,0 +1,76 @@
+# Spell Checker
+
+All PRs that are pushed to a Keptn repository
+are run through a spell checker that is based on the
+[check-spelling](https://github.com/check-spelling/check-spelling)
+GitHub action.
+
+Note, however, that you are still responsible for reading your text carefully.
+The tool does not flag if you used a real word that is not the right word,
+if you misuse "setup" versus "set up", and so forth.
+
+## Handling Spell Checker errors
+
+If you get a Spell Checker error:
+
+1. Right-click the `details` link for Spell Checker
+   in the CI results section of your PR.
+1. Search for "job summary" and click the link to that report.
+1. This shows the word(s) that caused Spell Checker to fail.
+
+   - If these are genuine misspellings,
+     correct the spelling in your local branch
+     or using the GitHub editor
+     and push the new commit to resolve the errors.
+
+   - If a word that is flagged is a legitimate word,
+     follow the instructions in the report
+     to propose adding it to our [dictionary](https://github.com/keptn/lifecycle-toolkit/blob/main/.github/actions/spelling/expect.txt).
+     This request will be added to your PR for review
+     and, if approved, will be merged when the PR is merged.
+
+   - If your PR includes a file that should not be spell-checked,
+     you can add it to the
+     [excludes.txt](https://github.com/keptn/lifecycle-toolkit/blob/main/.github/actions/spelling/excludes.txt) file
+     as part of your PR.
+     It will be reviewed and, if approved,
+     merged as part of your PR.
+
+For more details about handling errors that are found, see the
+[Check-spelling docs](https://docs.check-spelling.dev/).
+
+## Implementation details
+
+For full technical details about the spell checker, see:
+
+- [check-spelling documentation](https://docs.check-spelling.dev/)
+- [check-spelling GitHub repository](https://github.com/check-spelling/check-spelling)
+
+The Keptn spell checker checks both documentation and code for spelling,
+based on a set of dictionaries:
+
+- We use general English language and technical terminology
+  from dictionaries that are provided and maintained by check-spelling.
+  The configuration is specified in files in the
+  [.github/actions/spelling](https://github.com/keptn/lifecycle-toolkit/tree/main/.github/actions/spelling)
+  directory.
+  [expect.txt](https://github.com/keptn/lifecycle-toolkit/tree/main/.github/actions/spelling)
+  lists Keptn terms for both documentation and code.
+- We also use the specialized technical dictionaries provided by check-spelling specific domains
+  or programming languages such as Kubernetes, Go or HTML.
+  The dictionaries we use are specified in the
+  [.github/workflows/spell-checker.yml](https://github.com/keptn/lifecycle-toolkit/blob/main/.github/workflows/spell-checker.yml)
+  file.
+
+Check-spelling supports both American and British spelling
+and both are allowed in the Keptn documentation.
+
+Check-spelling provides dictionaries for a number of non-English languages
+but we do not currently use those.
+
+Note that Check-spelling does not check for proper capitalization of terms.
+All dictionary terms are listed with lowercase letters.
+Check-spelling recognizes capitalized versions of these words but,
+if capitalized words are listed in a dictionary,
+check-spelling rejects non-capitalized forms
+which are common in code.

docs/content/en/contribute/docs/spell-check/_index.md

@@ -0,0 +1,80 @@
+---
+title: Spell checker
+description: How to work with the spell checker
+weight: 375
+---
+
+All PRs that are pushed to a Keptn repository
+are run through a spell checker that is based on the
+[check-spelling](https://github.com/check-spelling/check-spelling)
+GitHub action.
+
+Note, however, that you are still responsible for reading your text carefully.
+The tool does not flag if you used a real word that is not the right word,
+if you misuse "setup" versus "set up", and so forth.
+
+## Handling Spell Checker errors
+
+If you get a Spell Checker error:
+
+1. Right-click the `details` link for Spell Checker.
+1. If you do not want to read through the whole (and rather verbose) log,
+   type `unrecognized words` in the search box at the top.
+1. This shows the word(s) that caused Spell Checker to fail.
+
+   - If these are genuine misspellings,
+     correct the spelling in your local branch
+     or using the github editor
+     and push the new commit to resolve the errors.
+
+   - If a word that is flagged is a legitimate word,
+     follow the instructions in the report
+     to propose adding it to our dictionary.
+     This request will be added to your PR for review
+     and, if approved, will be merged when the PR is merged.
+
+   - If your PR includes a file that should not be spell-checked,
+     you can add it to the
+     [excludes.txt](https://github.com/keptn/lifecycle-toolkit/blob/main/.github/actions/spelling/excludes.txt) file
+     as part of your PR.
+     It will be reviewed and, if approved,
+     merged as part of your PR.
+
+For more details about handling errors that are found, see the
+[Check-spelling docs](https://docs.check-spelling.dev/).
+
+## Implementation details
+
+For full technical details about the spell checker, see:
+
+- [check-spelling documentation](https://docs.check-spelling.dev/)
+- [check-spelling GitHub repository](https://github.com/check-spelling/check-spelling)
+
+The Keptn spell checker checks both documentation and code for spelling,
+based on a set of dictionaries:
+
+- We use general English language and technical terminology
+  from dictionaries that are provided and maintained by check-spelling.
+  The configuration is specified in files in the
+  [.github/actions/spelling](https://github.com/keptn/lifecycle-toolkit/tree/main/.github/actions/spelling)
+  directory.
+  [expect.txt](https://github.com/keptn/lifecycle-toolkit/tree/main/.github/actions/spelling)
+  lists Keptn terms for both documentation and code.
+- We also use the specialized technical dictionaries provided by check-spelling
+  for Kubernetes and Go.
+  The dictionaries we use are specified in the
+  [.github/workflows/spell-checker.yml](https://github.com/keptn/lifecycle-toolkit/blob/main/.github/workflows/spell-checker.yml)
+  file.
+
+Check-spelling supports both American and British spelling
+and both are allowed in the Keptn documentation.
+
+Check-spelling provides dictionaries for a number of non-English languages
+but we do not currently use those.
+
+Note that Check-spelling does not check for proper capitalization of terms.
+All dictionary terms are listed with lowercase letters.
+Check-spelling recognizes capitalized versions of these words but,
+if capitalized words are listed in a dictionary,
+check-spelling rejects non-capitalized forms
+which are common in code.

mkdocs.yml

@@ -172,6 +172,7 @@ nav:
           - Contribution guidelines for documentation: docs/contribute/docs/contrib-guidelines-docs.md
           - Build Documentation Locally: docs/contribute/docs/local-building.md
           - Linter Requirements: docs/contribute/docs/linter-requirements.md
+          - Spell Checker: docs/contribute/docs/spell-check.md
           - Source File Structure: docs/contribute/docs/source-file-structure.md
           - Published Doc Structure: docs/contribute/docs/publish.md
           - Word list: docs/contribute/docs/word-list.md