Documentation/ABI: Fix typos

Fix typos in Documentation/ABI.  The changes are in descriptions or
comments where they shouldn't affect use of the ABIs.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230814212822.193684-2-helgaas@kernel.org


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