Update Manifest.cs description of "OpenID Authorization Server" feature

[MarGraz]

According to this discussion #15381 (comment) I have added a "Note" in the description of "OpenID Authorization Server" feature. I'm not sure if it's the right place to add a note, but it's the only place available.

[sebastienros]

Should this description be part of a doc instead, or displayed as a notification if the feature is enabled? Seems weird to put that in the description.

[MarGraz]

@sebastienros, the issue was born from the fact that the "OpenId Authorization Server" does not automatically activate the "OpenId Token Validation". As a result, the "OpenId Token Validation" feature remained deactivated. I assumed, like others I think, that token validation by the server was automatic and required no additional actions. However, attempting to access ApiController.cs within OrchardCore.Contents as an Admin user, results in a 401 unauthorized error.
But, if you assigns full privileges to the "anonymous" user role for API access and omits the OAuth token, access is granted. This discrepancy led to considerable confusion until we have found this solution.

This experience highlights the need for clearer information in the module UI. Could an "info" ("i") icon be added next to the description, with bootstrap tooltips to provide additional details? This approach could be cleaner than the current method. The issue with using a notification is that it only appears once.

Additionally, updating the documentation to reflect this could be good.

Thank you