Fix errors in metric_score.pkg_metric_size_codebase doc

[fh-kpikhart]

Closes #329 and #330

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.85%. Comparing base (7c7bf3c) to head (aa51c71).

❗ Current head aa51c71 differs from pull request most recent head 6363c60. Consider uploading reports for the commit 6363c60 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #336   +/-   ##
=======================================
  Coverage   61.85%   61.85%           
=======================================
  Files          66       66           
  Lines        1025     1025           
=======================================
  Hits          634      634           
  Misses        391      391           

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