fix(docs): tweak migration instructions

[knownasilya]

No description provided.

[coveralls]

Coverage remained the same at 97.436% when pulling e0816a1 on knownasilya:patch-1 into 50171ef on mwpastore:master.

[mwpastore]

Hi Ilya,

Thanks for the PR. Those instructions only apply when migrating from ember-cli-deploy-mysql to ember-cli-deploy-sql, so it's not appropriate to update them in this way. The quick start instructions already direct the user to run the pipeline to finalize the install.

Thank you,

Mike