fixed file location in example

Author: brice

install_config/advanced_ldap_configuration/sssd_for_ldap_failover.adoc

@@ -395,7 +395,7 @@ created. To do so:
       apiVersion: v1
       kind: RequestHeaderIdentityProvider
       challengeURL: "https://proxy.example.com/challenging-proxy/oauth/authorize?${query}"
-      clientCA: /etc/origin/master/proxy/proxyca.crt
+      clientCA: /etc/origin/proxy/proxyca.crt
       headers:
       - X-Remote-User
 ----