[Insight-developers] Migration guides docs editing

[Julien Jomier]

> It's definitely the right thing to do. Make it easy for the users of
> the migration guide, including referencing multiple gerrit change IDs.
> If we have to, we should adapt our processing of the xml documents to
> account for this fact.

I think Cory is saying that the previous changes are obsolete, is that 
correct? If that's the case then the gerrit change ID should be the same.

Julien