enforce "related" functions order

[oakmac]

The related functions section in the cljsdoc files should always put cljs.core functions first, and then group similar namespace together if they exist.

The cheatsheet tooltips depend on the order being in this way.

I did this manually when I was creating the files, but we should add some code to the Gruntfile to check and make sure this is the case.

[shaunlebron]

I actually think the order specified in the file should be preserved. When I was writing docs, I would order the related symbols by strength of association.