efl/hint: fix hint_align docs

Summary:
the docs should not assume that the current language is LTR and should
instead specify that the horizontal direction depends on the language
reading direction

Reviewers: segfaultxavi

Reviewed By: segfaultxavi

Subscribers: cedric, reviewers, committers

Tags: efl

Differential Revision: https://phab.enlightenment.org/D9911