Webui: Share receivers have no access to versions

[mmattel]

WHAT Needs to be Documented?

Referencing: owncloud/ocis#5531 ([full-ci] Do not share versions)

• Share receivers have no access to versions.
• People in spaces with the "Editor" or "Manager" role can still see versions and work with them.

Note the referenced ocis PR is currently not merged.

WHERE Does This Need To Be Documented (Link)?

Webui - Sharing section

WHY Should This Change Be Made?

Completeness of docs

(Optional) What Type Of Content Change Is This?

• New Content Addition
• Old Content Deprecation
• Existing Content Simplification
• Bug Fix to Existing Content