Documentation updates (formatting)

no code changes

FL/Fl.H

@@ -60,7 +60,8 @@ extern FL_EXPORT const char* fl_local_ctrl;  ///< string pointer used in shortcu
 extern FL_EXPORT const char* fl_local_meta;  ///< string pointer used in shortcuts, you can change it to another language
 extern FL_EXPORT const char* fl_local_shift; ///< string pointer used in shortcuts, you can change it to another language
 
-/** \defgroup  callback_functions Callback function typedefs
+/** \defgroup  callback_functions  Callback Function Typedefs
+
   \brief Typedefs defined in <FL/Fl.H> for callback or handler functions passed as function parameters.
 
   FLTK uses callback functions as parameters for some function calls, e.g. to
@@ -73,7 +74,9 @@ extern FL_EXPORT const char* fl_local_shift; ///< string pointer used in shortcu
 
   \see  Fl::add_handler(), Fl::add_timeout(), Fl::repeat_timeout(),
         Fl::remove_timeout() and others
-  @{ */
+
+  @{
+*/
 
 /** Signature of some label drawing functions passed as parameters */
 typedef void (Fl_Label_Draw_F)(const Fl_Label *label, int x, int y, int w, int h, Fl_Align align);