Fix broken link to SAML2 login example

docs/modules/ROOT/pages/servlet/saml2/login/index.adoc

@@ -17,5 +17,5 @@ This process is similar to the one started in 2017 for xref:servlet/oauth2/index
 
 [NOTE]
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-A working sample for {gh-samples-url}/servlet/spring-boot/java/saml2-login[SAML 2.0 Login] is available in the {gh-samples-url}[Spring Security Samples repository].
+A working sample for {gh-samples-url}/servlet/spring-boot/java/saml2/login[SAML 2.0 Login] is available in the {gh-samples-url}[Spring Security Samples repository].
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