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Issue Type: Bug

The highlight syntax for comments is wrong for PowerShell files.
EG.

.\procedure.ps1 `
   -arg1 $variableforarg1 ` #this syntax highlighting should not resemble a comment
   -arg2 $variableforarg2 ` <#this syntax highlight should not resemble a comment because it's invalid to add a comment here #>
   -arg3 $variableforarg3 <#this syntax higlight should be correct#>`
   -arg4 $variableforarg4

The example above shows that the "arg1" and "arg2" have incorrect comments and should not by syntax higlighted as comments.

For me saddly as a beginner powershell user this was an issue when trying to deploy :(. Just want to make that you have a visual cues when using this and not commit a faulty powershell script in production like me.
P.S. if you use the PowerShell ISE it will syntax highlight correctly.

VS Code version: Code 1.31.1 (1b8e830, 2019-02-12T02:20:54.427Z)
OS version: Windows_NT x64 10.0.16299