plugins/lib: remove out-dated comments about plugin api.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24907 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lib/configfile.h

@@ -24,7 +24,7 @@
 #define TYPE_INT    1
 #define TYPE_ENUM   2
 #define TYPE_STRING 3
-#define TYPE_BOOL 4
+#define TYPE_BOOL   4
 
 struct configdata
 {

apps/plugins/lib/grey_core.c

@@ -479,7 +479,6 @@ static void fill_gvalues(void)
 /* Initialise the framework and prepare the greyscale display buffer
 
  arguments:
-   newrb     = pointer to plugin api
    gbuf      = pointer to the memory area to use (e.g. plugin buffer)
    gbuf_size = max usable size of the buffer
    features  = flags for requesting features

apps/plugins/lib/overlay.c

@@ -28,7 +28,6 @@
 /* load and run a plugin linked as an overlay. 
 
  arguments:
-   rb        = pointer to plugin api, also passed on to the overlay
    parameter = plugin parameter, passed on to the overlay
    filename  = overlay file name, absolute path as usual
    name      = overlay display name

apps/plugins/lib/playback_control.h

@@ -21,12 +21,13 @@
 #ifndef __PLAYBACK_CONTROL_H__
 #define __PLAYBACK_CONTROL_H__
 
-/* Use these if your menu uses the new menu api. 
-   REMEMBER to call playback_control_init(rb) before rb->do_menu()... 
+/* Use these if your menu uses the new menu api.
+   REMEMBER to call playback_control_init(parent) before rb->do_menu()...
    The parent viewport here is needed by the internal functions,
    So, make sure you use the same viewport for the rb->do_menu() call
    that you use in the playback_control_init() call
 */
+extern const struct menu_item_ex playback_control_menu;
 void playback_control_init(struct viewport parent[NB_SCREENS]);
 
 /* Use this if your menu still uses the old menu api */