[Markdown.MAML.Parser.MarkdownParser].ParseString does not process code blocks marked with single back ticks

[jhoneill]

Prerequisites

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

Steps to reproduce

1. As a test file I have download the MD help file for Get-Help from. https://github.com/MicrosoftDocs/PowerShell-Docs/blob/main/reference/7.2/Microsoft.PowerShell.Core/Get-Help.md
2. In VS Code I have set a break point on new-externalHelp but the important part is in the function GetMamlModelImpl which has a line $model = $p.ParseString($mdText, $parseMode, $_) (1605 in the .PSM1 file for v 0.14.2 )
3. After this line has run examine $model.children[17].spans[0]

The text looks like this

 Style Text
 ----- ----
Normal The `Get-Help` cmdlet displays information about PowerShell concepts and commands, including cmdlets,

The backticks around get help have not resulted it being placed in its own span with a style representing "code" nor have they been stripped out

Expected behavior

Back ticks don't appear in the output of get help, 
or in a perfect world Get-Help is able to do some rendering of code blocks.

Actual behavior

Output of Get-Help Get-Help looks like this


DESCRIPTION
    The `Get-Help` cmdlet displays information about PowerShell concepts and commands,

Error details

No message

Environment data

Directory: C:\Program Files\WindowsPowerShell\Modules

ModuleType Version    PreRelease Name                                PSEdition ExportedCommands
---------- -------    ---------- ----                                --------- ----------------
Script     0.14.2                platyPS                             Desk      {New-MarkdownHelp, Get-MarkdownMetadata, New-ExternalHelp, New-YamlHelp}



Name                           Value
----                           -----
PSVersion                      7.2.6
PSEdition                      Core
GitCommitId                    7.2.6
OS                             Microsoft Windows 10.0.22000
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visuals

No response

[sdwheeler]

The markdown parsing has totally changed in Microsoft.PowerShell.PlatyPS v1. However, the backticks are still maintained in the text when converted to MAML. Whether or not we should remove the backticks needs further discussion.