Replace stale method name in kerberos doc

[Lastpixl]

Update kerberos documentation to reflect API change in cd17acb

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.88%. Comparing base (90c5ff4) to head (790bd9c).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4857   +/-   ##
=======================================
  Coverage   80.88%   80.88%           
=======================================
  Files         368      368           
  Lines       90340    90340           
=======================================
+ Hits        73068    73071    +3     
+ Misses      17272    17269    -3     

see 6 files with indirect coverage changes

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[gpotter2]

Thanks for the PR.