Minor corrections to InnoDB function comments

innobase/include/mem0mem.h:
  Correct the comment of mem_heap_create_func().
innobase/include/mem0mem.ic:
  Correct the comment of mem_heap_create_func().
sql/ha_innodb.cc:
  Correct comments regarding return value

innobase/include/mem0mem.h

@@ -99,8 +99,7 @@ heap freeing. */
 /*********************************************************************
 NOTE: Use the corresponding macros instead of this function. Creates a
 memory heap which allocates memory from dynamic space. For debugging
-purposes, takes also the file name and line as argument in the debug
-version. */
+purposes, takes also the file name and line as argument. */
 UNIV_INLINE
 mem_heap_t*
 mem_heap_create_func(

innobase/include/mem0mem.ic

@@ -371,8 +371,7 @@ mem_heap_free_top(
 /*********************************************************************
 NOTE: Use the corresponding macros instead of this function. Creates a
 memory heap which allocates memory from dynamic space. For debugging
-purposes, takes also the file name and line as argument in the debug
-version. */
+purposes, takes also the file name and line as argument. */
 UNIV_INLINE
 mem_heap_t*
 mem_heap_create_func(

sql/ha_innodb.cc

@@ -1191,7 +1191,7 @@ Opens an InnoDB database. */
 handlerton*
 innobase_init(void)
 /*===============*/
-			/* out: TRUE if error */
+			/* out: &innobase_hton, or NULL on error */
 {
 	static char	current_dir[3];		/* Set if using current lib */
 	int		err;
@@ -2492,7 +2492,7 @@ Closes a handle to an InnoDB table. */
 int
 ha_innobase::close(void)
 /*====================*/
-				/* out: error number */
+				/* out: 0 */
 {
   	DBUG_ENTER("ha_innobase::close");