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

[jhoneill]

Prerequisites

• [X] Write a descriptive title.
• [X] Make sure you are able to repro it on the latest released version
• [X] 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