(MAINT) Update documentation for AvoidUsingBrokenHashAlgorithms

[michaeltlombardi]

PR Summary

Prior to this change, the documentation for the new rule, AvoidUsingBrokenHashAlgorithms, was not reflowed and had the same metadata description as UseCmdletCorrectly.

To keep this document in sync with the one in the published docset, this change reflows the document to 100 characters and corrects the metadata.

This is related to the work in MicrosoftDocs/PowerShell-Docs-Modules#90.

PR Checklist

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