[Docs] Update cloudflare_ruleset schema (#24475)

Author: yue4u

src/content/docs/cache/how-to/cache-rules/terraform-example.mdx

@@ -56,7 +56,9 @@ resource "cloudflare_ruleset" "cache_rules_example" {
         cache_deception_armor      = true
         custom_key {
           query_string {
-            exclude = ["*"]
+            exclude {
+              all = true
+            }
           }
           header {
             include        = ["habc", "hdef"]