docs: enhance load command documentation with usage details and examples

Author: NonSwag

content/docs/worlds/manage/load.mdx

@@ -2,3 +2,13 @@
 title: Load a world
 description: How to use the world load command.
 ---
+
+You can load existing worlds with the `/world load <world>` command.  
+You can only load worlds that are managed by Worlds,
+if you want to load a world that is not managed by Worlds, [import](/docs/worlds/manage/import) the world instead.
+
+## Example
+
+```
+/world load MyWorld
+```