revise based on feedback

Signed-off-by: Jody Garnett <[email protected]>

CONTRIBUTING.md

@@ -9,11 +9,11 @@ Thank you for contributing to GeoNetwork:
 
 * Pull request is required, even if you have commit access, so the tests are run and other developer can check your code.
 
-* Pull requests must be applied to `master`, before bing backported.
+* Pull requests must be applied to `master`, before being backported.
 
 * Good housekeeping: Anytime you commit, try and clean the code around it to latest style guide. If you improve a function without comments: add comments. If you modify functionality that does not have tests: write a test. If you fix functionality without documentation: add documentation.
 
-* History: Clean commit messages and history: avoid big commits with hundreds of files, break commits commits up into understandable chunks, longer verbose commit messages are encouraged.
+* History: Clean commit messages and history: avoid big commits with hundreds of files, break commits commits up into understandable chunks, longer verbose commit messages are encouraged. Beware of reformatting and needless whitespace changes.
 
 * Draft: Use pull request *Draft** (or even the text "WIP") to identify work in progress.