English guide typo [skip ci]

docs/guide/structure-controllers.md

@@ -69,7 +69,7 @@ End users address actions through the so-called *routes*. A route is a string th
 * a module ID: this exists only if the controller belongs to a non-application [module](structure-modules.md);
 * a controller ID: a string that uniquely identifies the controller among all controllers within the same application
   (or the same module if the controller belongs to a module);
-* an action ID: a string t hat uniquely identifies the action among all actions within the same controller.
+* an action ID: a string that uniquely identifies the action among all actions within the same controller.
 
 Routes take the following format: