Merge branch 'jfarmiloe-docs-ai-gateway-url-example' into 'master'

Update AI Gateway URL example to not use localhost

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/184421



Merged-by: Suzanne Selhorn <sselhorn@gitlab.com>
Approved-by: Suzanne Selhorn <sselhorn@gitlab.com>
Co-authored-by: Justin Farmiloe <jfarmiloe@gitlab.com>