Update-MarkdownCommandHelp duplicates Parameter content if HelpMessage is specified

[JustinGrote]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest version
• Search the existing issues.

Steps to reproduce

Expected behavior

If the first line exactly matches the HelpMessage, preserve everything below (to enable the addition of additional context to the MD file)

If the first line does not match the helpmessage, only update the first line. Maybe have a `-ReplaceParameterHelp` option to force a direct replacement if the helpmessage is updated.

Also the helpmessage part of the YAML isn't populated correctly

Actual behavior

See Above

Error details

N/A

Environment data

Name                           Value
----                           -----
PSVersion                      7.6.1
PSEdition                      Core
GitCommitId                    7.6.1
OS                             Microsoft Windows 10.0.26200
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.4
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Version

1.01

Visuals

No response