- Tweak Quick Edit error/feedback strings
- Fix comments to reflect Quick Edit error related API changes
- Fix outdated FileSyncManager docs
Further improve Quck Edit error strings. Break out a new separate case for
cursor pos being ambiguous between two class names.

Fix some more JSDoc typos found in code review.
Code review: tweak wording of comment
Merge pull request #7349 from adobe/pflynn/quickedit-error-strings

Tweak Quick Edit error strings & update docs