Fixed broken external links

Related to: https://gitlab.com/gitlab-org/technical-writing/-/issues/492

doc/integration/elasticsearch.md

@@ -91,7 +91,7 @@ The former Ruby-based indexer was removed in [GitLab 12.3](https://gitlab.com/gi
 First, we need to install some dependencies, then we build and install
 the indexer itself.
 
-This project relies on [International Components for Unicode](http://site.icu-project.org/) (ICU) for text encoding,
+This project relies on [International Components for Unicode](https://icu.unicode.org/) (ICU) for text encoding,
 therefore we must ensure the development packages for your platform are
 installed before running `make`.
 

doc/integration/gitpod.md

@@ -28,7 +28,7 @@ To use the GitLab Gitpod integration, it must be enabled for your GitLab instanc
   1. It's [enabled and configured by a GitLab administrator](#configure-a-self-managed-instance).
   1. It's [enabled in their user settings](#enable-gitpod-in-your-user-settings).
 
-To learn more about Gitpod, see their [features](https://www.gitpod.io/features/) and
+To learn more about Gitpod, see their [features](https://www.gitpod.io/features) and
 [documentation](https://www.gitpod.io/docs/).
 
 ## Enable Gitpod in your user settings

doc/integration/jira/development_panel.md

@@ -69,7 +69,7 @@ To simplify administration, we recommend that a GitLab group maintainer or group
 
 | Jira usage | GitLab.com customers need | GitLab self-managed customers need |
 |------------|---------------------------|------------------------------------|
-| [Atlassian cloud](https://www.atlassian.com/cloud) | The [GitLab.com for Jira Cloud app](https://marketplace.atlassian.com/apps/1221011/gitlab-com-for-jira-cloud?hosting=cloud&tab=overview) installed from the [Atlassian Marketplace](https://marketplace.atlassian.com). This offers real-time sync between GitLab.com and Jira. For more information, see the documentation for the [GitLab.com for Jira Cloud app](connect-app.md). | The [GitLab.com for Jira Cloud app](https://marketplace.atlassian.com/apps/1221011/gitlab-com-for-jira-cloud?hosting=cloud&tab=overview), using a workaround process. See the documentation for [installing the GitLab.com for Jira Cloud app for self-managed instances](connect-app.md#install-the-gitlabcom-for-jira-cloud-app-for-self-managed-instances) for more information. |
+| [Atlassian cloud](https://www.atlassian.com/migration/assess/why-cloud) | The [GitLab.com for Jira Cloud app](https://marketplace.atlassian.com/apps/1221011/gitlab-com-for-jira-cloud?hosting=cloud&tab=overview) installed from the [Atlassian Marketplace](https://marketplace.atlassian.com). This offers real-time sync between GitLab.com and Jira. For more information, see the documentation for the [GitLab.com for Jira Cloud app](connect-app.md). | The [GitLab.com for Jira Cloud app](https://marketplace.atlassian.com/apps/1221011/gitlab-com-for-jira-cloud?hosting=cloud&tab=overview), using a workaround process. See the documentation for [installing the GitLab.com for Jira Cloud app for self-managed instances](connect-app.md#install-the-gitlabcom-for-jira-cloud-app-for-self-managed-instances) for more information. |
 | Your own server | The [Jira DVCS (distributed version control system) connector](dvcs.md). This syncs data hourly. | The [Jira DVCS Connector](dvcs.md). |
 
 Each GitLab project can be configured to connect to an entire Jira instance. That means after

doc/integration/jira/index.md

@@ -20,7 +20,7 @@ in your GitLab project with any of your projects in Jira.
 ### Jira integration
 
 This integration connects one or more GitLab projects to a Jira instance. The Jira instance
-can be hosted by you or in [Atlassian cloud](https://www.atlassian.com/cloud).
+can be hosted by you or in [Atlassian cloud](https://www.atlassian.com/migration/assess/why-cloud).
 The supported Jira versions are `v6.x`, `v7.x`, and `v8.x`.
 
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