docs(migration): add end to end upgrade info to migration doc

There are a couple of changes to some Protractor tests that need to be made
when migrating from AngularJS 1.2 to 1.3 - document these in the migration
guide.

See https://github.com/angular/protractor/issues/1480
Formatting is awful in the Migration sectin anyway, but putting a comma after `due to [...](..)` and either a newline or changing `Some` to lower-case, would make it more consistently awfully formatted :)