docs: removed bolding from header (#28001)

removed extra ** after heading two

docs/docs/contributing/tutorials/docs.mdx

@@ -8,7 +8,7 @@ This tutorial will guide you through making a simple documentation edit, like co
 
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-## Editing a Documentation Page on GitHub**
+## Editing a Documentation Page on GitHub
 
 Sometimes you want to make a small change, like fixing a typo, and the easiest way to do this is to use GitHub's editor directly.