docker: Update documentation for officially provided Docker images

docs/docker.md

@@ -14,32 +14,27 @@ Open ports can also be passed through using `-p <host_port>:<container_port>`.
 
 For Example:
 ```bash
-# Building the image using buildx and loading it into docker
-docker buildx build -t tshock:latest --load .
-
-# Running the image
 docker run -p 7777:7777 -p 7878:7878 \
            -v /home/cider/tshock/:/tshock \
            -v /home/cider/.local/share/Terraria/Worlds:/worlds \
            -v /home/cider/tshock/plugins:/plugins \
-           --rm -it tshock:latest \
+           --rm -it ghcr.io/pryaxis/tshock:latest \
            -world /worlds/backflip.wld -motd "OMFG DOCKER"
 ```
 
-## Building for Other Platforms
+## Building custom images
 
-Using `docker buildx`, you could build [multi-platform images](https://docs.docker.com/build/building/multi-platform/) for TShock.
+Occasionally, it may be necessary to adjust TShock with customizations that are not included in the upstream project.
+Therefore, these changes are also not available in the officially provided Docker images.
+
+To build and load a Docker image from your local checkout, use the following `buildx` command:
 
-For Example:
 ```bash
-# Building the image using buildx and loading it into docker
-docker buildx build -t tshock:linux-arm64 --platform linux/arm64 --load .
-
-# Running the image
-docker run -p 7777:7777 -p 7878:7878 \
-           -v /home/cider/tshock/:/tshock \
-           -v /home/cider/.local/share/Terraria/Worlds:/worlds \
-           -v /home/cider/tshock/plugins:/plugins \
-           --rm -it tshock:linux-arm64 \
-           -world /worlds/backflip.wld -motd "ARM64 ftw"
+docker buildx build -t tshock:latest --load .
+```
+
+It is also possible to build [multi-platform images](https://docs.docker.com/build/building/multi-platform/) for TShock (e.g. an image targeting `arm64`, on a host that is not `arm64`):
+
+```bash
+docker buildx build -t tshock:linux-arm64 --platform linux/arm64 --load .
 ```