Update internal links to use proper suffix

Our style guide specifies internal links must end with a .md
suffix. This commit fixes a set of internal links that ended
with .html instead of .md.

doc/ci/chatops/README.md

@@ -23,7 +23,7 @@ A new `run` action has been added to the [slash commands](../../integration/slas
 
 After the job has finished, its output is sent back to Slack provided it has completed within 30 minutes. If a job takes more than 30 minutes to run it must use the Slack API to manually send data back to a channel.
 
-[Developer access and above](../../user/permissions.html#project-members-permissions) is required to use the `run` command. If a job should not be able to be triggered from chat, it can be set to `except: [chat]`.
+[Developer access and above](../../user/permissions.md#project-members-permissions) is required to use the `run` command. If a job should not be able to be triggered from chat, it can be set to `except: [chat]`.
 
 ## Creating a ChatOps CI job
 
@@ -31,7 +31,7 @@ Since ChatOps is built upon GitLab CI/CD, the job has all the same features and
 
 - It is strongly recommended to set `only: [chat]` so the job does not run as part of the standard CI pipeline.
 - If the job is set to `when: manual`, the pipeline will be created however the job will wait to be started.
-- It is important to keep in mind that there is limited support for access control. If the user who triggered the slash command is a developer in the project, the job will run. The job itself can utilize existing [CI/CD variables](../variables/README.html#predefined-environment-variables) like `GITLAB_USER_ID` to perform additional rights validation, however these variables can be [overridden](../variables/README.html#priority-of-environment-variables).
+- It is important to keep in mind that there is limited support for access control. If the user who triggered the slash command is a developer in the project, the job will run. The job itself can utilize existing [CI/CD variables](../variables/README.md#predefined-environment-variables) like `GITLAB_USER_ID` to perform additional rights validation, however these variables can be [overridden](../variables/README.md#priority-of-environment-variables).
 
 ### Controlling the ChatOps reply
 

doc/ci/ci_cd_for_external_repos/github_integration.md

@@ -13,7 +13,7 @@ Watch a video on [Using GitLab CI/CD pipelines with GitHub repositories](https:/
 
 NOTE: **Note:**
 Because of [GitHub limitations](https://gitlab.com/gitlab-org/gitlab/issues/9147),
-[GitHub OAuth](../../integration/github.html#enabling-github-oauth)
+[GitHub OAuth](../../integration/github.md#enabling-github-oauth)
 cannot be used to authenticate with GitHub as an external CI/CD repository.
 
 ## Connect with Personal Access Token

doc/ci/docker/using_docker_build.md

@@ -152,7 +152,7 @@ This requires GitLab Runner 11.11 or higher.
 The Docker daemon supports connection over TLS and it's done by default
 for Docker 19.03.1 or higher. This is the **suggested** way to use the
 docker-in-docker service and
-[GitLab.com Shared Runners](../../user/gitlab_com/index.html#shared-runners)
+[GitLab.com Shared Runners](../../user/gitlab_com/index.md#shared-runners)
 support this.
 
 1. Install [GitLab Runner](https://docs.gitlab.com/runner/install/).

doc/development/documentation/workflow.md

@@ -208,7 +208,7 @@ code reviewer have ensured:
 
 ### When documentation is required
 
-Documentation [is required](../contributing/merge_request_workflow.html#definition-of-done) for a
+Documentation [is required](../contributing/merge_request_workflow.md#definition-of-done) for a
 milestone when:
 
 - A new or enhanced feature is shipped that impacts the user or administrator experience.

doc/development/kubernetes.md

@@ -170,7 +170,7 @@ kubectl logs <pod_name> --follow -n gitlab-managed-apps
 
 ## GitLab Managed Apps
 
-GitLab provides [GitLab Managed Apps](../user/clusters/applications.html), a one-click install for various applications which can be added directly to your configured cluster.
+GitLab provides [GitLab Managed Apps](../user/clusters/applications.md), a one-click install for various applications which can be added directly to your configured cluster.
 
 **<i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
-For an overview of how to add a new GitLab-mananged app, see [How to add GitLab-managed-apps to Kubernetes integration](https://youtu.be/mKm-jkranEk).**
+For an overview of how to add a new GitLab-managed app, see [How to add GitLab-managed-apps to Kubernetes integration](https://youtu.be/mKm-jkranEk).**

doc/development/scalability.md

@@ -96,7 +96,7 @@ A recent [database checkup shows a breakdown of the table sizes on
 GitLab.com](https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/8022#master-1022016101-8).
 Since `merge_request_diff_files` contains over 1 TB of data, we will want to
 reduce/eliminate this table first. GitLab has support for [storing diffs in
-object storage](../administration/merge_request_diffs.html), which we [will
+object storage](../administration/merge_request_diffs.md), which we [will
 want to do on
 GitLab.com](https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/7356).