fix: add missing punctuation to error report (#2752)

[jsoref]

• fixes #2752

before

[Check Spelling/Check Spelling] failed to read 'action.yml' from action 'checkout' with path '' of step file does not exist
failed to read 'action.yaml' from action 'checkout' with path '' of step file does not exist
failed to read 'Dockerfile' from action 'checkout' with path '' of step file does not exist

after

[Check Spelling/Check Spelling] failed to read 'action.yml' from action 'checkout' with path '' of step: file does not exist
failed to read 'action.yaml' from action 'checkout' with path '' of step: file does not exist
failed to read 'Dockerfile' from action 'checkout' with path '' of step: file does not exist

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.68%. Comparing base (bd4bc99) to head (3cae4b9). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2753      +/-   ##
==========================================
+ Coverage   74.65%   74.68%   +0.02%     
==========================================
  Files          73       73              
  Lines       11139    11139              
==========================================
+ Hits         8316     8319       +3     
+ Misses       2186     2184       -2     
+ Partials      637      636       -1     

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