docs: update namespaces changeset (#2989)

.changeset/seven-melons-kneel.md

@@ -11,9 +11,20 @@ import { defineWorld } from "@latticexyz/world";
 
 export default defineWorld({
   namespaces: {
-    app: {
-      tables: { ... },
-      systems: { ... },
+    game: {
+      tables: {
+        Player: { ... },
+        Position: { ... },
+      },
+    },
+    guilds: {
+      tables: {
+        Guild: { ... },
+      },
+      systems: {
+        MembershipSystem: { ... },
+        TreasurySystem: { ... },
+      },
     },
   },
 });
@@ -22,13 +33,19 @@ export default defineWorld({
 Once you use the top-level `namespaces` config option, your project will be in "multiple namespaces mode", which expects a source directory structure similar to the config structure: a top-level `namespaces` directory with nested namespace directories that correspond to each namespace label in the config.
 
 ```
-mud-project/
-├─ mud.config.ts
-└─ src/
-   └─ namespaces/
-      └─ app/
-         ├─ TasksSystem.sol
-         └─ codegen/
-            ├─ tables/
-            └─ Tasks.sol
+~/guilds
+├── mud.config.ts
+└── src
+    └── namespaces
+        ├── game
+        │   └── codegen
+        │       └── tables
+        │           ├── Player.sol
+        │           └── Position.sol
+        └── guilds
+            ├── MembershipSystem.sol
+            ├── TreasurySystem.sol
+            └── codegen
+                └── tables
+                    └── Guild.sol
 ```