Fix parameter name mismatches.
/**
* gtk_text_buffer_begin_irreversible_action:
- * @self: a #Gtktextbuffer
+ * @buffer: a #Gtktextbuffer
*
* Denotes the beginning of an action that may not be undone. This will cause
* any previous operations in the undo/redo queue to be cleared.
/**
* gtk_text_buffer_end_irreversible_action:
- * @self: a #Gtktextbuffer
+ * @buffer: a #Gtktextbuffer
*
* Denotes the end of an action that may not be undone. This will cause
* any previous operations in the undo/redo queue to be cleared.