vfs: inode insertion kdoc corrections

Some minor corrections to the inode_insert5 and iget5_locked kernel
documentation.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Link: https://lore.kernel.org/r/20241004115151.44834-1-agruenba@redhat.com


Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>