“Edit on GitHub” button is broken on version branches.

[abernix]

As discovered on the “v2” (version 2) apollo-server documentation:

https://www.apollographql.com/docs/apollo-server/v2/

[abernix]

The Meteor documentation seems to be less broken (the “Edit on GitHub” button doesn’t 404), but still points to the wrong branch. Not too surprisingly, as I hadn’t ever considered the “Edit on GitHub” button when implementing it.