docs: sparse: fix invalid link addresses

The http and git links are invalid, replace them with valid links.

Signed-off-by: Min-Hua Chen <minhuadotchen@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20230804112320.35592-1-minhuadotchen@gmail.com