Github generate site fails to generate links with anchors.

[Lmh-java]

Discovered at #14740 (comment).

In that PR, we've changed the Pattern[] property type. When running GitHub, generate site, #14740 (comment) is returned.

Actual:

https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/9f55855_2024115508/index.html

https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/9f55855_2024115508/checks/imports/importorder.html#Properties

https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/9f55855_2024115508/property_types.html#

Expect:

The last link should be

...
https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/9f55855_2024115508/property_types.html#Pattern.5B.5D

Reproduce:

1. Modify the Pattern[] property documentation to make a difference.
2. Open a PR and run GitHub, generate site.

Analysis:

#14740 (comment).

Edit: From just glancing, it looks like the code is looking at the source for subsection with an id and not section with a name.