fs: namei: Fix spelling mistake "Retuns" to "Returns"

There are two spelling mistake in comments. Fix it.
Signed-off-by: YangXin <yx.0xffff@gmail.com>
Link: https://lore.kernel.org/r/20231118132136.3084-1-yx.0xffff@gmail.comSigned-off-by: Christian Brauner <brauner@kernel.org>

fs/namei.c

@@ -2467,7 +2467,7 @@ static int handle_lookup_down(struct nameidata *nd)
 	return PTR_ERR(step_into(nd, WALK_NOFOLLOW, nd->path.dentry));
 }
 
-/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
+/* Returns 0 and nd will be valid on success; Returns error, otherwise. */
 static int path_lookupat(struct nameidata *nd, unsigned flags, struct path *path)
 {
 	const char *s = path_init(nd, flags);
@@ -2522,7 +2522,7 @@ int filename_lookup(int dfd, struct filename *name, unsigned flags,
 	return retval;
 }
 
-/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
+/* Returns 0 and nd will be valid on success; Returns error, otherwise. */
 static int path_parentat(struct nameidata *nd, unsigned flags,
 				struct path *parent)
 {