Review help text and examples

[jrodewig]

Problem

The help text is currently inconsistent and, in some areas, erroneous or incomplete. It's also a bit wordy in places.

Solution

Addresses issues in the help text:

• Indicate fauna database create/delete can be used for top-level DBs.
• Change --performanceHints to kebab-case.
• Use space-separated lists for array value examples.
• Use --no- for false boolean values.
• Replace Mutually exclusive with with Can't be used with
• Add /dir to /path/to/schema/ examples
• Remove unneeded formatting.
• Add examples for fauna local
• Where possible, reword the text for brevity.

Result

Better docs? ✨

Testing

npm run test:local. Also manually reviewed all -h output.

[ecooper]

Nice.

That performanceHints miss must have been during a merge. I swear I changed it earlier. 😆