Fixed syntax error for link with spaces

Author: palonsoro

modules/understanding-upgrade-channels.adoc

@@ -87,7 +87,7 @@ You can use the `stable-{product-version}` channel to upgrade from a previous mi
 == eus-4.6 channel
 
 In addition to the stable channel, certain minor versions of {product-title} offer an
-Extended Update Support[https://access.redhat.com/support/policy/updates/openshift#ocp4_phases] (EUS).
+link:https://access.redhat.com/support/policy/updates/openshift#ocp4_phases[Extended Update Support] (EUS).
 These EUS versions extend the maintenance phase for customers with Premium Subscriptions
 to 14 months. {product-title} 4.6 is currently the only minor version with EUS.