Use commit SHA to reference line in code
Use commit SHA to reference line in code

The Host model in Transition has been modified since this documentation was first written, which means that the link that references a particular line in the code is not longer highlighting the correct part. We should use a particular point in time to ensure that this doesn't happen in the future.
alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs