fix: Insert code to the beginning

This makes more sense.

Author: bebraw

src/dependency.ts

@@ -74,7 +74,7 @@ class DocGenTemplate extends NullDependency.Template {
       typePropName: this.options.docgenOptions.typePropName || "type",
     }).substring(userRequest.length);
 
-    source.insert(userRequest.length, docgenBlock);
+    source.insert(0, docgenBlock);
   }
 }