Whitespace and codestyling in bp-activity

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7906 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Fix phpdoc for bp_activity_update_meta_cache

git-svn-id: https://buddypress.svn.wordpress.org/trunk@7907 cdf35c40-ae34-48e0-9cc9-0c9da1808c22