Fix direct links to the clang and libxo reports

Newlines within the <title> element are retained and processed into
HTML-encoded newlines in the anchor ids, which do not function as
desired. Thanks to Mark Eichin for the diagnosis.

While here, un-wrap a couple of <url> elements, as the hover-text
renders poorly when newlines are included there as well.

Approved by: hrs (mentor, blanket)