Update README.md

README.md

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 <details>
   <summary>
-  ## 💫StarCoder</summary>
+    <h2>
+      💫StarCoder
+    </h2>
+  </summary>
   StarCoder is a 15.5B parameters language model for code trained for 1T tokens on 80+ programming languages. It uses MQA for efficient generation, has 8,192 tokens context window and can do fill-in-the-middle.
   
   ### Models