Add --livereload flag to mkdocs serve command

Author: Aevarkan

docs/creating-your-site.md

@@ -196,7 +196,7 @@ write your documentation. The server will automatically rebuild the site upon
 saving. Start it with:
 
 ``` sh
-mkdocs serve # (1)!
+mkdocs serve --livereload # (1)!
 ```
 
 1.  If you have a large documentation project, it might take minutes until