website: maintainer update

Author: ilg-ul

website/docs/maintainer/_project/_content.mdx

@@ -24,12 +24,12 @@ git clone \
 git -C ~/Work/xpack-build-box.git submodule update --init --recursive
 ```
 
-For the development version use the `develop` branch:
+For the development version use the `development` branch:
 
 ```sh
 rm -rf ~/Work/xpack-build-box.git; \
 git clone \
-  --branch develop \
+  --branch development \
   https://github.com/xpack/xpack-build-box.git \
   ~/Work/xpack-build-box.git; \
 git -C ~/Work/xpack-build-box.git submodule update --init --recursive