Merge branch 'docs-update-prod-architecture-links' into 'master'

Fixes doc/development/architecture.md prod links.

See merge request gitlab-org/gitlab-ce!20455

doc/development/architecture.md

@@ -70,7 +70,7 @@ The add-on component gitlab-shell serves repositories over SSH. It manages the S
 
 Gitaly executes git operations from gitlab-shell and the GitLab web app, and provides an API to the GitLab web app to get attributes from git (e.g. title, branches, tags, other meta data), and to get blobs (e.g. diffs, commits, files).
 
-You may also be interested in the [production architecture of GitLab.com](https://about.gitlab.com/handbook/infrastructure/production-architecture/).
+You may also be interested in the [production architecture of GitLab.com](https://about.gitlab.com/handbook/engineering/infrastructure/production-architecture/).
 
 ### Installation Folder Summary