Update Readme.md

Signed-off-by: Amit Jangid <amitjangid80@yahoo.in>

Author: amitjangid80

Readme.md

@@ -66,7 +66,7 @@ func CreateIndex() {
 
 ```go
 func CreateIndex() {
-	// For Single Field
+	// For Multiple Fields
 	indexModel := mongo.IndexModel{
 		Options: options.Index().SetUnique(true),
 		Keys: bson.D{
@@ -75,12 +75,6 @@ func CreateIndex() {
 		},
 	}
 
-	// For Multiple Fields
-	indexModel := mongo.IndexModel{
-		Keys:    bson.M{"YOUR_FIELD_NAME": 1, "ANOTHER_FIELD_NAME": 1},
-		Options: options.Index().SetUnique(true),
-	}
-
 	mongodb_client.CreateIndex("YOUR_DB_NAME", "YOUR_COLLECTION_NAME", indexModel)
 }
 ```