Module documentation guidelines: Implement hook_help()

Problem/Motivation

The Module Documentation Guidelines state:

All but the most trivial modules should implement hook_help().

The OpenID Connect module does not implement this hook.

Proposed resolution

Implement hook_help().

Remaining tasks

Patch pending.

User interface changes

The users with appropriate user rights will be able to get a summary of what the module does within the back-end.

API changes

None.

Data model changes

None.