Some issues were brought up at T152036#2861383. Let's fix them. Pasting here too:
> Some of these extensions could use a documentation refresh. The QuickSurvey docs on how to actually a survey are too vague to be useful (I ended up not testing it). RelatedArticles has some strange behavior which should probably be mentioned on the description page ($wgRelatedArticlesShowInFooter gets ignored if BetaFeatures are not installed; $wgRelatedArticlesUseCirrusSearch gets ignored in the sidebar); $wgRelatedArticlesShowReadMore does not seem to exist anymore.
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=== AC
* Both extensions have a "Getting Started" section in their documentation.
* Both extensions' dependencies are documented.
** Are the dependencies hard or soft?
* The subtleties of the config variables mentioned above are documented in the README and on mw.org.
* The process of creating and enabling a survey is documented in the codebase and on mw.org.
** Are there any differences between dev and prod?