Fix auto-linking of inline @see tags for dynamic hooks.

[coffee2code]

As spotted by @DrewAPicture, dynamic hooks referenced via inline@see tags are not linked properly.

For example: ​https://developer.wordpress.org/reference/functions/get_page_template/ contains a generated URL for the $type_template dynamic hook of:

https://developer.wordpress.org/reference/functions/‘$type_template’

The URL should be:

https://developer.wordpress.org/reference/hooks/type_template/

The issue stems from the presence of the $ in dynamic hooks, which causes the current link_internal_element() regex for hooks to fail, leading to the fallback conditional block (which is meant to handle functions) to be executed. This is the reason the bad URL is pointing to /functions/ and not /hooks/.

And, obviously, the proper link should also be sanitized to remove the $, ‘, and ’.

[coffee2code]

In 3233:

developer.wordpress.org: Fix auto-linking of inline @see tags for dynamic hooks.

• Fix regex for hooks in link_internal_element () to allow $.
• Remove $ and encoded quotes from hook slug in URL.
• Don't capture encoded quotes in match for slug, saving the need to remove them.

Fixes #1730.