Minor reword

Author: javiereguiluz

security/impersonating_user.rst

@@ -87,7 +87,7 @@ Knowing When Impersonation Is Active
 
 When a user is being impersonated, Symfony grants them a special role called
 ``ROLE_PREVIOUS_ADMIN`` (in addition to the roles the user may have). Use this
-special role, for instance, to show in a template a link to exit impersonation:
+special role, for instance, to show a link to exit impersonation in a template:
 
 .. code-block:: html+twig