Hook documentation for bp-activity-classes.php.

Props tw2113.
See #5938.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9110 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Hook documentation for bp-activity-filters.php.

Props tw2113.
See #5938.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9111 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Hook documentation for bp-activity-loader.php and bp-activity-screens.php.

Props tw2113.
See #5938.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9112 cdf35c40-ae34-48e0-9cc9-0c9da1808c22