FIx documented hook names for features rebuild & revert

Quick fixes to docs for a couple hook implementations:

 /**
- * Implements [component]_features_export_rebuild().
+ * Implements [component]_features_rebuild().
  */
 function uuid_entities_features_rebuild($module_name) {
   uuid_entities_rebuild($module_name, 'rebuild');
 }
 
 /**
- * Implements [component]_features_export_revert().
+ * Implements [component]_features_revert().
  */
 function uuid_entities_features_revert($module_name) {

(This is a mistake in Features API docs too: #1159390: incorrect revert hook name in features.api.php?.)