fix document

[ShotaKitazawa]

fix document of https://argocd-image-updater.readthedocs.io/en/stable/configuration/applications

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #201 (391cbe4) into master (0ac4343) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #201   +/-   ##
=======================================
  Coverage   66.71%   66.71%           
=======================================
  Files          20       20           
  Lines        1517     1517           
=======================================
  Hits         1012     1012           
  Misses        412      412           
  Partials       93       93           

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[jannfis]

Good catch, thanks a lot @ShotaKitazawa !

LGTM.