Merge pull request #8279 from docker/404-links

404 links

docker-for-windows/install.md

@@ -54,7 +54,7 @@ Hub](https://hub.docker.com/editions/community/docker-ce-desktop-windows){:
 Looking for information on using Windows containers?
 
 * [Switch between Windows and Linux
-  containers](https://docs.docker.com/docker-for-windows/#switch-between-windows-and-linux-containers)
+  containers](/docker-for-windows/index.md#switch-between-windows-and-linux-containers)
   describes the Linux / Windows containers toggle in Docker Desktop for Windows and
   points you to the tutorial mentioned above.
 * [Getting Started with Windows Containers
@@ -99,7 +99,7 @@ accessible from any terminal window.
 
 If the whale is hidden in the Notifications area, click the up arrow on the
 taskbar to show it. To learn more, see [Docker
-Settings](index.md#docker-settings-dialog).
+Settings](/docker-for-windows/index.md#docker-settings-dialog).
 
 If you just installed the app, you also get a popup success message with
 suggested next steps, and a link to this documentation.

registry/help.md

@@ -7,7 +7,7 @@ title: Get help
 If you need help, or just want to chat, you can reach us:
 
 - on the [Docker forums](https://forums.docker.com/c/open-source-projects/opensrcreg).
-- on the [Docker community Slack](https://dockercommunity.slack.com/messages/C31GQCJN7/).
+- on the [Docker community Slack](https://blog.docker.com/2016/11/introducing-docker-community-directory-docker-community-slack/).
 - on the [mailing list](https://groups.google.com/a/dockerproject.org/forum/#!forum/distribution) (mail at <distribution@dockerproject.org>).
 
 If you want to report a bug: