[DOC] Add documentation for workspace privacy settings

[Kapian1234]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request.
OSD will support workspace privacy settings to quickly configure access for all users, but it currently lacks documentation.

Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
2.19
What other resources are available? Provide links to related issues, POCs, steps for testing, etc.