manager.c: Add missing parameters to Login documentation

[gtjoseph]

• Added the AuthType and Key parameters for MD5 authentication.

• Added the Events parameter.

Resolves: #689

[gtjoseph]

cherry-pick-to: 16 cherry-pick-to: 18 cherry-pick-to: 20 cherry-pick-to: 21 cherry-pick-to: certified/18.9 cherry-pick-to: certified/20.7

[gtjoseph]

N.B. We still produce the documentation for the 16 branch even though we don't accept changes to it.

[github-actions[bot]]

Successfully merged to branch master and cherry-picked to ["16","18","20","21","certified/18.9","certified/20.7"]