Fix the DSC overview URL in a markdown file and some small cleanup changes

[daxian-dbw]

PR Summary

Fix the DSC overview URL in a markdown file and some small cleanup changes.

The DSC overview URL is causing CI builds to fail: https://github.com/PowerShell/PowerShell/runs/4540816967
The Find-DotNet is a little too verbose. Remove the explicit -Verbose parameter to make it not print redundant messages.

Before:

After:

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the title (the WIP bot will keep its status check at Pending while the prefix is present) and remove the prefix when the PR is ready.
• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
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  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.

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This PR has 6 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label : Extra Small Size : +3 -3 Percentile : 2.4% Total files changed: 4 Change summary by file extension: .psm1 : +2 -2 .md : +1 -1 .cs : +0 -0 

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[daxian-dbw]

Merge the PR to unblock CI builds.

[ghost]

🎉v7.3.0-preview.2 has been released which incorporates this pull request.:tada:

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