Update installation.md

Update note on guard-based authentication
scheb · Nov 12, 2018 · 82953de · 82953de
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commit 82953de
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diff --git a/Resources/doc/installation.md b/Resources/doc/installation.md
@@ -78,7 +78,8 @@ scheb_two_factor:
         - Acme\AuthenticationBundle\Token\CustomAuthenticationToken
 ```
 
-For a guard based authentication method it would be needed to support `Symfony\Component\Security\Guard\Token\PostAuthenticationGuardToken` token class.
+For a guard-based authentication method, you have to configure the
+`Symfony\Component\Security\Guard\Token\PostAuthenticationGuardToken` token class.
 
 ### Step 6: Enable two-factor authentication methods