Fix markdown typo in templates.md

Signed-off-by: Marcin Czarnecki <[email protected]>

Author: scyzoryck

docs/data/material/getting-started/templates/templates.md

@@ -42,7 +42,7 @@ You can find complete templates and themes like those shown below in the <a href
 </span>
 </a>
 
-## ## Experimental- Toolpad
+## Experimental- Toolpad
 
 If you're looking to build internal tools and dashboards fast, but don't want to start building from scratch, you can find examples of functional dashboards–with authentication, routing, and theming already integrated–in the [featured examples section](https://mui.com/toolpad/core/introduction/examples/#featured-examples) of the Toolpad Core docs.