lib: parser: update documentation for match_NUMBER functions

lib: parser: update documentation for match_NUMBER functions

commit 67222c4ba8af ("lib: parser: optimize match_NUMBER apis to use local
array") removed -ENOMEM as a possible return value, so update the comments
accordingly.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 67222c4ba8af ("lib: parser: optimize match_NUMBER apis to use local array")
Signed-off-by: Eric Biggers <[email protected]>
Cc: Li Lingfeng <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Yu Kuai <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>