Correct phpdoc for `bp_activity_recurse_comment_count()` and `bp_activity_get_comment_count()`. Also formally deprecate `$args` in `bp_activity_get_comment_count()` and add filter at the end of `bp_activity_recurse_comment_count()` so it can be manipulated by third party plugins.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8718 cdf35c40-ae34-48e0-9cc9-0c9da1808c22