Improve BatchLoader documentation

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I think it's worth improving our BatchLoader::Graphql documentation to include the error I got here Couldn't find a connection wrapper for ... which may indicate the block may have been left off the BatchLoader load call.

The following discussion from !118721 (closed) should be addressed:

• @cablett started a discussion: (+14 comments)

  I added this because without it we get strange pagination blips as it can't sort by id as it would expect. Let me know if this isn't acceptable (I'm sure we can override the pagination in the connection)