/**
* Gets an array of message keys describing the changes made to the
- * visibility of the revision.
- *
- * If the resulting array is $arr, then $arr[0] will contain an array of
- * message keys describing the items that were hidden, $arr[1] will contain
- * an array of message keys describing the items that were unhidden, and $arr[2]
- * will contain an array with a single message key, which can be one of
- * "revdelete-restricted", "revdelete-unrestricted", or null, indicating (un)suppression.
+ * visibility of the revision.
+ *
+ * If the resulting array is $arr, then $arr[0] will contain an array of
+ * keys describing the items that were hidden, $arr[1] will contain
+ * an array of keys describing the items that were unhidden, and $arr[2]
+ * will contain an array with a single message key, which can be one of
+ * "revdelete-restricted", "revdelete-unrestricted" indicating (un)suppression
+ * or null to indicate nothing in particular.
+ * You can turn the keys in 0 and 1 into message keys by appendin -hid and
+ * and -unhid to they keys respectively.
*
* @param $n Integer: the new bitfield.
* @param $o Integer: the old bitfield.