:memo: Add vim command to update plugins

Guides/vim.md

@@ -76,3 +76,9 @@ Three commands : `:diffget LO`, `:diffget BO`, `:diffget RE`
 `zo`
 
 Useful to see more context.
+
+## Plugins
+
+[Vundle](https://github.com/VundleVim/Vundle.vim) seems to be a standard.
+
+Open vim and use the `:PluginUpdate` command to automatically update your plugins.