multiple issues detecting documentation keywords

[msftrncs]

Environment

• Editor and Version: VS Code: 1.26.0 (with manual tweaks)
• Your primary theme: Dark+

Issue Description

Presently, the documentation keyword detection/scoping/theming fails on the following items:

• # .keyword doesn't detect and scope
• <# .keyword doesn't detect and scope
• once inside a comment block, extra # separated by spaces allows the keyword to detect, but Get-Help doesn't seem to permit this.
• once inside a comment block, extra characters after a keyword that doesn't accept arguments allows the keyword to detect, but Get-Help doesn't seem to permit this.

Screenshots

(Showing modified sample from file attached to #134)

Expected Behavior

Expected to match Get-Help's acceptance. However, that's much more difficult. Get-Help also accepts:

• <# #> # <additional #s> .keyword
• does not accept .keyword if the containing comment doesn't otherwise start at the beginning of a line
• and has limited acceptance of consecutively spaced and required placement, that probably only script analysis can accurately report on.

Possible Fix

I think two changes could fix the easiest problems.

1. Change the match for 'commentEmbeddedDocs' to
   (#\1 match)

"(?:^|\G)(?i:\s*(\.)(COMPONENT|DESCRIPTION|EXAMPLE|EXTERNALHELP|FORWARDHELPCATEGORY|FORWARDHELPTARGETNAME|FUNCTIONALITY|INPUTS|LINK|NOTES|OUTPUTS|REMOTEHELPRUNSPACE|ROLE|SYNOPSIS))(?:\s*$)"

(#\2 Match)

"(?:^|\G)(?i:\s*(\.)(PARAMETER|FORWARDHELPTARGETNAME|FORWARDHELPCATEGORY|REMOTEHELPRUNSPACE|EXTERNALHELP)\s+([a-z0-9-_]+))"

2. Change 'begin' match for 'commentLine' to

"(?<![`\\-])(#)#*"

and change the capture from "0" to "1".

With the changes applied, this is the result:

(not necessary valid, I know)

# .synopsis
<# .synopsis
.synopsis
<#
# ## ## .DESCRIPTION blah blah
    This is a script function that will install HealOps on "X" system.
#>

[msftrncs]

I want to point out that the project file, 'build.ps1' contains malformed help documentation.
.EXAMPLE Build
.EXAMPLE Test

These both cause Get-Help to not display any of the comment help.

[msftrncs]

This will be the one of the next items I'll contribute a PR for.