Documentation: fix typo for abituguru documentation

Typo fix for abituguru,abituguru3 and abituguru-datasheet

Signed-off-by: Brandon Jiang <brandon.jiang.a@outlook.com>
Link: https://lore.kernel.org/r/DM5PR22MB0892E4FEFCA9ED055B0A8E71AC580@DM5PR22MB0892.namprd22.prod.outlook.com


Signed-off-by: Jonathan Corbet <corbet@lwn.net>