docs: improve README examples for expand parameter

Co-authored-by: pawcoding <78467484+pawcoding@users.noreply.github.com>

Author: Copilot

README.md

@@ -315,17 +315,34 @@ The live loader supports expanding relation fields directly in the API request,
 This is useful when you need to access related data without making additional requests.
 
 ```ts
+// Expand single relation field
 const blogLive = defineLiveCollection({
   loader: experimentalPocketbaseLiveLoader({
-    ...options,
+    url: "https://<your-pocketbase-url>",
+    collectionName: "posts",
     experimental: {
-      // Expand single relation field
       expand: ["author"]
+    }
+  })
+});
 
-      // Expand multiple relation fields
+// Expand multiple relation fields
+const blogLive = defineLiveCollection({
+  loader: experimentalPocketbaseLiveLoader({
+    url: "https://<your-pocketbase-url>",
+    collectionName: "posts",
+    experimental: {
       expand: ["author", "category"]
+    }
+  })
+});
 
-      // Expand nested relations (up to 6 levels deep)
+// Expand nested relations (up to 6 levels deep)
+const blogLive = defineLiveCollection({
+  loader: experimentalPocketbaseLiveLoader({
+    url: "https://<your-pocketbase-url>",
+    collectionName: "posts",
+    experimental: {
       expand: ["author.profile", "category.parent"]
     }
   })