Clarify design traineeship being optional
Why is this change being made?
Done in the context of gitlab-org/gitlab-design#858 (closed).
The phrasing of design traineeship being optional for someone to become a maintainer wasn't clear, as pointed out by @nudalova (!45728 (comment 320050708)).
This MR also updates some of the Markdown reference links.
Does this MR meet the acceptance criteria?
Assign to DRI
-
Did you assign this change to the correct DRI of the page or information you are changing?
Conformity
-
Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
Edited by Taurie Davis