Document new optional parameters added to UseCorrectCasing in #1704

[bergmeister]

PR Summary

Document new optional parameters added in #1704

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
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[sdwheeler]

I included the changes for this doc in #2085. This can be closed as duplicate.

[bergmeister]

@sdwheeler I am sorry but I cannot see the inclusion of the changes in this PR in your referenced PR: https://github.com/PowerShell/PSScriptAnalyzer/pull/2085/files#diff-65eddc24e7332880f1aa75b3f8f70c0efe805cf8e497eba1ca732fcad6eb0d16
Therefore re-opening

[sdwheeler]

@bergmeister Sorry, I had a draft of changes for this that was formatted differently. I thought that is what I was including. I don't know what happened to it.

Please go ahead with this PR.