update code example (#333)

(cherry picked from commit d8ea569)

Author: mongoKart

source/fundamentals/indexes.txt

@@ -306,10 +306,10 @@ collection:
       :language: go
 
       coll := client.Database("sample_mflix").Collection("movies")
-      indexModel := mongo.IndexModel{Keys: bson.D{{"title", 1}}}
+      indexModel := mongo.IndexModel{Keys: bson.D{{"plot", "text"}, {"default_language", "italian"}}}
       name, err := coll.Indexes().CreateOne(context.TODO(), indexModel)
       if err != nil {
-          panic(err)
+         panic(err)
       }
 
       fmt.Println("Name of Index Created: " + name)