Summary:
Only the number was being used, and in places were it should not be.
Now the Since version appears only in <summary> tags, with proper
context (Since EFL 1.22).
Test Plan: make && gendoc should produce DocFX pages which make more sense.
Reviewers: lauromoura, zmike, bu5hm4n
Reviewed By: lauromoura
Subscribers: cedric, #reviewers, #committers
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D8012