Fix PHPdoc, add PHPStan/Psalm annotations for authMethods property in CompositeAuth class.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.47%. Comparing base (22889d3) to head (dc46eb0).

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #20494   +/-   ##
=========================================
  Coverage     64.47%   64.47%           
  Complexity    11578    11578           
=========================================
  Files           433      433           
  Lines         37604    37604           
=========================================
  Hits          24245    24245           
  Misses        13359    13359           

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