add spaces badges

docs/source/model_summary.mdx

@@ -69,6 +69,9 @@ that at each position, the model can only look at the tokens before the attentio
 <a href="model_doc/openai-gpt">
 <img alt="Doc" src="https://img.shields.io/badge/Model_documentation-openai--gpt-blueviolet">
 </a>
+<a href="https://huggingface.co/spaces/akhaliq/openai-gpt">
+<img alt="Spaces" src="https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Spaces-blue">
+</a>
 
 [Improving Language Understanding by Generative Pre-Training](https://cdn.openai.com/research-covers/language-unsupervised/language_understanding_paper.pdf), Alec Radford et al.
 
@@ -85,6 +88,9 @@ classification.
 <a href="model_doc/gpt2">
 <img alt="Doc" src="https://img.shields.io/badge/Model_documentation-gpt2-blueviolet">
 </a>
+<a href="https://huggingface.co/spaces/akhaliq/gpt2">
+<img alt="Spaces" src="https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Spaces-blue">
+</a>
 
 [Language Models are Unsupervised Multitask Learners](https://d4mucfpksywv.cloudfront.net/better-language-models/language_models_are_unsupervised_multitask_learners.pdf),
 Alec Radford et al.
@@ -103,6 +109,9 @@ classification.
 <a href="model_doc/ctrl">
 <img alt="Doc" src="https://img.shields.io/badge/Model_documentation-ctrl-blueviolet">
 </a>
+<a href="https://huggingface.co/spaces/akhaliq/tiny-ctrl">
+<img alt="Spaces" src="https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Spaces-blue">
+</a>
 
 [CTRL: A Conditional Transformer Language Model for Controllable Generation](https://arxiv.org/abs/1909.05858),
 Nitish Shirish Keskar et al.