Merge branch 'docs/fix-external-links' into 'master'

Update broken links to new destinations

See merge request gitlab-org/gitlab-ce!27155

doc/administration/integration/terminal.md

@@ -11,7 +11,7 @@ One of the things it uses these credentials for is providing access to
 ## How it works
 
 A detailed overview of the architecture of web terminals and how they work
-can be found in [this document](https://gitlab.com/gitlab-org/gitlab-workhorse/blob/master/doc/terminal.md).
+can be found in [this document](https://gitlab.com/gitlab-org/gitlab-workhorse/blob/master/doc/channel.md).
 In brief:
 
 - GitLab relies on the user to provide their own Kubernetes credentials, and to

doc/ci/examples/test_phoenix_app_with_gitlab_ci_cd/index.md

@@ -11,7 +11,7 @@ last_updated: 2019-03-06
 
 [Phoenix][phoenix-site] is a web development framework written in [Elixir][elixir-site], which is a
 functional language designed for productivity and maintainability that runs on the
-[Erlang VM][erlang-site]. Erlang VM is really really fast and can handle very large numbers of
+[Erlang VM](https://www.erlang.org). Erlang VM is really really fast and can handle very large numbers of
 simultaneous users.
 
 That's why we're hearing so much about Phoenix today.
@@ -27,7 +27,7 @@ and GitLab UI._
 ### What is Phoenix?
 
 [Phoenix][phoenix-site] is a web development framework written in [Elixir][elixir-site] very useful
- to build fast, reliable, and high-performance applications, as it uses [Erlang VM][erlang-site].
+ to build fast, reliable, and high-performance applications, as it uses [Erlang VM](https://www.erlang.org).
 
 Many components and concepts are similar to Ruby on Rails or Python's Django. High developer
 productivity and high application performance are only a few advantages on learning how to use it.
@@ -406,7 +406,6 @@ other reasons][ci-reasons] to keep using GitLab CI/CD. The benefits to our teams
 [elixir-site]: http://elixir-lang.org/ "Elixir"
 [elixir-mix]: http://elixir-lang.org/getting-started/mix-otp/introduction-to-mix.html "Introduction to mix"
 [elixir-docs]: http://elixir-lang.org/getting-started/introduction.html "Elixir Documentation"
-[erlang-site]: http://erlang.org "Erlang"
 [elixir-install]: https://elixir-lang.org/install.html "Elixir Installation"
 [ecto]: http://hexdocs.pm/ecto "Ecto"
 [ecto-repo]: https://hexdocs.pm/ecto/Ecto.html#module-repositories "Ecto Repositories"

doc/development/contributing/index.md

@@ -3,9 +3,6 @@
 Thank you for your interest in contributing to GitLab. This guide details how
 to contribute to GitLab in a way that is easy for everyone.
 
-We want to create a welcoming environment for everyone who is interested in contributing.
-Please visit our [Code of Conduct page](https://about.gitlab.com/contributing/code-of-conduct) to learn more about our commitment to an open and welcoming environment.
-
 For a first-time step-by-step guide to the contribution process, please see
 ["Contributing to GitLab"](https://about.gitlab.com/contributing/).
 
@@ -33,8 +30,8 @@ vulnerabilities.
 
 ## Code of conduct
 
-Our code of conduct can be found on the
-["Contributing to GitLab"](https://about.gitlab.com/contributing/) page.
+We want to create a welcoming environment for everyone who is interested in contributing.
+Please visit our [Code of Conduct page](https://about.gitlab.com/community/contribute/code-of-conduct/) to learn more about our commitment to an open and welcoming environment.
 
 ## Closing policy for issues and merge requests