fix(comments): Links encodage (#1033)

[Rushaway]

Description

The issue is that links in comments are being displayed as "$1" instead of the actual URL.
This is caused by how preg_replace() is being used in the link processing function.
The $ character is being escaped with a backslash in the replacement pattern, causing PHP to interpret "$1" literally instead of replacing it with the captured reference.

Motivation and Context

#1033

How Has This Been Tested?

See repro of #1033

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.