Update oidc.rst: match example file name to import

[elohmeier]

Just a small typo fix. If users copy the example module reference from below they can avoid the import error if the file is named correctly.

Description of the Change

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[n2ygk]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (07d2715) 97.56% compared to head (d0e343a) 97.56%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1396   +/-   ##
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  Coverage   97.56%   97.56%           
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  Files          32       32           
  Lines        2132     2132           
=======================================
  Hits         2080     2080           
  Misses         52       52           

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