doc: improve documentation of onRequestPermissionResult and onRequestPermissionsResult

[GitToTheHub]

Platforms affected

Android

Motivation and Context

• Make clear, that these methods are not only called, when the user grants permissions, but also when he denies them or the request was interrupted.
• Add note, how the call chain ist
• Make clear, that onRequestPermissionResult is legacy and should not be used anymore
• Add Android Developer documentation link for the new onRequestPermissionsResult

Description

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.43%. Comparing base (2450217) to head (869e685).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1920   +/-   ##
=======================================
  Coverage   61.43%   61.43%           
=======================================
  Files          24       24           
  Lines        4922     4922           
=======================================
  Hits         3024     3024           
  Misses       1898     1898           

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