[Security] Add PHPDoc to AuthenticationEvents
merged branch franmomu/add_phpdoc_to_authentication_events (PR #6831)

This PR was merged into the 2.1 branch.

Commits
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e7624b6 [Security] Add PHPDoc to AuthenticationEvents

Discussion
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[Security] Added PHPDoc to AuthenticationEvents

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |
Merge branch '2.1' into 2.2

* 2.1:
  fixed a circular call (closes #6864)
  Correct comment in NativeSessionStorage regarding session.save_handler
  [Security] Add PHPDoc to AuthenticationEvents