Use correct hostname with TLS for GOV.UK
Capitalise Performance Platform as elsewhere

https://github.com/alphagov/government-service-design-manual/commit/4f4e9c534c258f8589230eff7b319d035512efbe

https://github.com/alphagov/government-service-design-manual/pull/220#commitcomment-4250328
Merge pull request #21 from alphagov/template-words-and-urls

Templates: words and URLs