Update index.html

Author: tcbegley

docs/templates/index.html

@@ -61,7 +61,7 @@ <h2>Get started quickly</h2>
 )
 
 app.layout = dbc.Alert(
-    "Hello, Bootstrap!" className="m-5"
+    "Hello, Bootstrap!", className="m-5"
 )
 
 if __name__ == "__main__":