Remove language about documentation committer from core governance

I'm +1 on this patch and removing some of the language.

Let's complete #3327844: Convert governance docs to markdown, redirect d.o page to Gitlab UI as canonical version → before committing this.

Thank you, @jhodgdon.

#3327844: Convert governance docs to markdown, redirect d.o page to Gitlab UI as canonical version → landed, converting this to apply to the markdown repo now.

Automatically closed - issue fixed for 2 weeks with no activity.