fix(doc): Add "compilerOptions" to bun-types README.md (#5325)

Reading the documentation on bun-types it was not clear to me that the tsconfig.ts needs to look like this:

```
{
  "compilerOptions": {
    "types": ["bun-types"]
  }
}
```

So i added the "compilerOptions" information.

Author: philolo1

packages/bun-types/README.md

@@ -21,9 +21,11 @@ Add this to your `tsconfig.json` or `jsconfig.json`:
 
 ```jsonc-diff
   {
-    
-+   "types": ["bun-types"],
-    
+    "compilerOptions": {
++     "types": ["bun-types"]
+      // other options...
+    }
+
     // other options...
   }
 ```