Add ```powershell``` code fences where appropriate

[chenrylee]

The Powershell docs have been migrated to new place, and now they all became good-look.
I have read some articles, and found the code blocks are not highlighted.
Indeed, this feature is supported.
I picked a block in an article, it's the original style:

PS> Get-Command -Name Clear-Host

CommandType     Name                            Definition
-----------     ----                            ----------
Function        Clear-Host                      $spaceType = [System.Managem...

if we add the language tag, it shows:

PS> Get-Command -Name Clear-Host

CommandType     Name                            Definition
-----------     ----                            ----------
Function        Clear-Host                      $spaceType = [System.Managem...

Yes, just add powershell following the first 3-grave mark.

  ```powershell

Can you please update all code blocks within the articles?

[joeyaiello]

We do this generally as we see it. Unfortunately, the syntax highlighting doesn't come out too well in examples like yours where there's output, so that might be why you're not seeing it in certain places.

[kiazhi]

Shouldn't the PS:\> be excluded.

Example below:
```powershell
Get-Command -Name Clear-Host
```
```text
CommandType Name Definition
----------- ---- ----------
Function Clear-Host $spaceType = [System.Managem...
```

Output as below:

Get-Command -Name Clear-Host

CommandType     Name                            Definition
-----------     ----                            ----------
Function        Clear-Host                      $spaceType = [System.Managem...

[zjalexander]

that's what I have in the Style Guide, yeah.

[sdwheeler]

@chenrylee @zjalexander Now that we have moved the documentation to docs.microsoft.com, we can leave the PS:\> prompts in the examples. The copy button on the frame of the text box will remove the prompts when it copies the text to the clipboard. This allows the code to be more 'paste-able' to the command line.

[kiazhi]

Hi @sdwheeler,

Its great to know that it omit PS:\> in the examples, but does it also omit PS C:\> in the examples too? Reason for that question is that there are about ~10000 results in 1437 files that contains PS C:\> in examples in this PowerShell-Docs repo.

[sdwheeler]

@kiazhi
It works on any inside a markdown code fence.

[zjalexander]

So as per the style guide:

• Omit PS C:/>

The style guide does NOT have the following:

```powershell
Get-Command -Name Clear-Host
```
```text
CommandType Name Definition
Function Clear-Host $spaceType = [System.Managem...
```

Given how docs is rendering it, we do prefer that and I will update the style guide. However, instead of ```text we can use ```output which Docs recommends.

We should fix this as we touch individual articles.

[zjalexander]

PowerShell/platyPS#294 there is also a related PlatyPS ask to insert this automatically.

[MSAdministrator]

@zjalexander Is this up for grabs? I can take this and run through the MDs and submit a PR