Update README.md

Author: rlhagerm

python/example_code/bedrock-runtime/README.md

@@ -64,6 +64,10 @@ functions within the same service.
 
 - [InvokeModel](models/amazon_titan_image_generator/invoke_model.py#L4)
 
+### Amazon Titan Text
+
+- [InvokeModel](models/amazon_titan_text/invoke_model.py#L4)
+
 ### Amazon Titan Text Embeddings
 
 - [InvokeModel](models/amazon_titan_text_embeddings/invoke_model.py#L4)