Kerberos keytab doc

[Lastpixl]

Ticketer.open_file was renamed to open_ccache in cd17acb. This PR changes the function name in the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.20%. Comparing base (0648c0d) to head (e7e4822).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4742   +/-   ##
=======================================
  Coverage   82.20%   82.20%           
=======================================
  Files         361      361           
  Lines       87195    87195           
=======================================
+ Hits        71679    71680    +1     
+ Misses      15516    15515    -1     

see 4 files with indirect coverage changes

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[gpotter2]

Thanks for the PR.