Update from code changes: document collaborative source mode - #7270

Running Vale across on the following files affected by this PR:

- editor/collaborate.mdx
- editor/index.mdx
- editor/keyboard-shortcuts.mdx
- editor/publish.mdx
- es/editor/collaborate.mdx
- es/editor/index.mdx
- es/editor/keyboard-shortcuts.mdx
- es/editor/publish.mdx
- fr/editor/collaborate.mdx
- fr/editor/index.mdx
- fr/editor/keyboard-shortcuts.mdx
- fr/editor/publish.mdx
- zh/editor/collaborate.mdx
- zh/editor/index.mdx
- zh/editor/keyboard-shortcuts.mdx
- zh/editor/publish.mdx
- es/help-center/publish-button-disabled-invalid-mdx.mdx
- fr/help-center/publish-button-disabled-invalid-mdx.mdx
- help-center/publish-button-disabled-invalid-mdx.mdx
- zh/help-center/publish-button-disabled-invalid-mdx.mdx

Attempting to initialize Vale linter...
Customer vale configuration detected. Attempting to sync packages...
Packages synced successfully.
Attempting to run Vale spellcheck...
Vale spellcheck completed successfully.

editor/collaborate.mdx:
	- 23:291    Did you really mean 'else's'?

editor/publish.mdx:
	- 74:211    In general, use active voice instead of passive voice ('are hidden').

help-center/publish-button-disabled-invalid-mdx.mdx:
	- 3:56    In general, use active voice instead of passive voice ('is disabled').
	- 7:45    In general, use active voice instead of passive voice ('is disabled').


Found 4 suggested changes across 3 files in 2525.09ms