ha_innodb.cc, row0ins.c, fil0fil.c:

  Correct typo

innobase/fil/fil0fil.c

@@ -2885,7 +2885,7 @@ fil_load_single_table_tablespace(
 	}
 
 	/* We do not use the size information we have about the file, because
-	the rounding formulat for extents and pages is somewhat complex; we
+	the rounding formula for extents and pages is somewhat complex; we
 	let fil_node_open() do that task. */
 
 	fil_node_create(filepath, 0, space_id, FALSE);

innobase/row/row0ins.c

@@ -1192,7 +1192,7 @@ run_again:
 			dtuple_print(ef, entry);
 			fputs("\nBut the parent table ", ef);
 			ut_print_name(ef, trx, foreign->referenced_table_name);
-		fputs("\nor its .ind file does not currently exist!\n", ef);
+		fputs("\nor its .ibd file does not currently exist!\n", ef);
 			mutex_exit(&dict_foreign_err_mutex);
 
 			return(DB_NO_REFERENCED_ROW);

sql/ha_innodb.cc

@@ -4977,7 +4977,7 @@ the SQL statement in case of an error. */
 int
 ha_innobase::external_lock(
 /*=======================*/
-			        /* out: 0 or HA_ERR_CRASHED */
+			        /* out: 0 */
 	THD*	thd,		/* in: handle to the user thread */
 	int 	lock_type)	/* in: lock type */
 {