fix: apply JTBD navtitle for cluster roles page

Change navtitle from "Configuring cluster roles for users" to
"Grant additional permissions to users" to match downstream JTBD title.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: gtrivedi88

modules/secure/pages/configuring-cluster-roles-for-users.adoc

@@ -1,7 +1,7 @@
 :_content-type: PROCEDURE
 :description: Configuring cluster roles for {prod-short} users
 :keywords: administration-guide, user, roles, permissions
-:navtitle: Configuring cluster roles for {prod-short} users
+:navtitle: Grant additional permissions to users
 :page-aliases: administration-guide:configuring-cluster-roles-for-users.adoc