chore: format

docs/getting-started/concepts.md

@@ -127,7 +127,7 @@ That's where a React Router specific `history` object comes into play. It provid
 
 ```js
 let history = createBrowserHistory();
-history.listen(({location, action}) => {
+history.listen(({ location, action }) => {
   // this is called whenever new locations come in
   // the action is POP, PUSH, or REPLACE
 });