Some smaller housekeeping

[eva-mueller-coremedia]

When implementing #480 I git aware of some things which can be cleaned up like

• Typos
• Unused methods
• Simplifications
• JavaDoc alignments
• Some additional tests

Testing done

Only covered by unit tests.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

Attention: Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.74%. Comparing base (41f98d9) to head (a8a876a).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/org/jenkinsci/plugins/oic/OicSecurityRealm.java	44.44%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #509      +/-   ##
============================================
+ Coverage     71.73%   72.74%   +1.01%     
- Complexity      222      236      +14     
============================================
  Files            17       18       +1     
  Lines          1033     1064      +31     
  Branches        148      147       -1     
============================================
+ Hits            741      774      +33     
  Misses          201      201              
+ Partials         91       89       -2     

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