Add more complete inline documentation for `get_term_link()`.

Adds more complete parameter descriptions for the `$term` and `$taxonomy` parameters. 

Props amruta123.b for the initial patch.
Fixes #29901.


git-svn-id: https://develop.svn.wordpress.org/trunk@29866 602fd350-edb4-49c9-b593-d223f7449a82