doc: Fixup some SMCCC links

This is a fixup for patch 3ba55a3c5fa260c9218be1adff8f39fc2a568d68
("docs: Update SMCCC doc, other changes for release"), where some
links names got changed but their references didn't.

Change-Id: I980d04dde338f3539a2ec1ae2e807440587b1cf5
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
2 files changed