guides: Fix link to docker setup

Author: Teufelchen1

doc/guides/getting-started/installing.mdx

@@ -18,7 +18,7 @@ and has the most extensive documentation and community support.
 
 Some distributions, such as Fedora, do not provide the necessary packages for
 cross compilation. In this case, it is recommended to use the
-[RIOT Docker Container](/docs/guides/build-in-docker).
+[RIOT Docker Container](/build-system/build-in-docker/).
 
 #### Windows
 Windows is supported through Windows Subsystem for Linux (WSL).
@@ -42,7 +42,7 @@ We also offer Docker images that make it a bit easier to develop on macOS.
 :::note
 It is also possible to run RIOT in a Docker container.
 
-This is especially useful if you want to avoid installing the required software packages on your host system. For more information, see the [Build in Docker](/docs/guides/build-in-docker) guide.
+This is especially useful if you want to avoid installing the required software packages on your host system. For more information, see the [Build in Docker](/build-system/build-in-docker/) guide.
 :::
 
 Depending on the operation distribution you are using, the installation of the required software packages may vary.