Documentation for allowing browse into restricted paths.

See here:

Browse storage doesn't work for users with restricted read access.

This is important information, and it should be included in our main documentation for Nexus Repo 3 browse content selector privileges.

Expected: Update the content selector privilege documentation in Nexus Repo 3 with the information in the article above. No update is needed for Nexus Repo 2 documentation, since we have very few new installs of that product.