MDL-14679 Fixed regression in phpdoc block caused by previous mass search and replace

For a second, I panicked reading that mod/{modname}/mod_form.php are now
deprecated in favour of mod/{modname}.mod_form.php Fortunately, git-blame
and git-show helped me to realize what happened here in 7cac0c4b

course/moodleform_mod.php

@@ -6,8 +6,7 @@ if (!empty($CFG->enablecompletion) or !empty($CFG->enableavailability)) {
 
 /**
  * This class adds extra methods to form wrapper specific to be used for module
- * add / update forms (mod/{modname}.mod_form.php replaces deprecated mod/{modname}/mod_form.php
- *
+ * add / update forms mod/{modname}/mod_form.php replaced deprecated mod/{modname}/mod.html
  */
 abstract class moodleform_mod extends moodleform {
     /** Current data */