Syntax Highlight w/ Perl, Comment Not Detected After 'sub'

[alexr00]

Originally from @mebouck in microsoft/vscode#127467:

Issue Type: Bug

A comment after a subroutine definition isn't detected, for example:

sub getPi  # calculate and return the value of pi

VS Code version: Code 1.57.1 (507ce72a4466fbb27b715c3722558bb15afa9f48, 2021-06-17T13:28:07.755Z)
OS version: Windows_NT x64 10.0.19042
Restricted Mode: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4900MQ CPU @ 2.80GHz (8 x 2794)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: enabled_on video_decode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.91GB (10.10GB free)
Process Argv	--crash-reporter-id 6d724ebe-c32e-4348-8853-6a2057864cf0
Screen Reader	no
VM	0%

Extensions (11)

Extension	Author (truncated)	Version
Bookmarks	ale	13.1.0
kixtart	cya	0.0.1
autoit	Dam	1.0.6
perl-syntax	jac	0.0.7
vscode-dotnet-runtime	ms-	1.1.0
python	ms-	2021.6.944021595
vscode-pylance	ms-	2021.6.3
jupyter	ms-	2021.6.999662501
cpptools	ms-	1.4.1
powershell	ms-	2021.6.2
azurerm-vscode-tools	msa	0.15.1

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