Fix service name

This isn't Content API - it's documentation for Content API. The new
cookie banner would read "Cookies on Content API" without this change,
which is a little confusing

Author: yndajas

config/tech-docs.yml

@@ -3,7 +3,7 @@ host: https://content-api.publishing.service.gov.uk
 
 # Header-related options
 show_govuk_logo: true
-service_name: Content API
+service_name: Content API docs
 service_link: /
 phase: Beta