Update introduction.en.mdx

Suggest adding the link to the playground.

pages/introduction.en.mdx

@@ -4,4 +4,4 @@ Prompt engineering is a relatively new discipline for developing and optimizing
 
 This guide covers the basics of prompts to provide a rough idea of how to use prompts to interact and instruct large language models (LLMs). 
 
-All examples are tested with `text-davinci-003` (using OpenAI's playground) unless otherwise specified. It uses the default configurations, i.e., `temperature=0.7` and `top-p=1`.
+All examples are tested with `text-davinci-003` using [OpenAI's playground](https://platform.openai.com/playground) unless otherwise specified. The model uses the default configurations, i.e., `temperature=0.7` and `top-p=1`.