Fix a small typo introduced in last PR

Author: sagidlow

modules/openshift-cluster-maximums-major-releases.adoc

@@ -66,7 +66,7 @@ Tested Cloud Platforms for {product-title} 4.x: Amazon Web Services, Microsoft A
 
 | Number of custom resource definitions (CRD)
 | There is no default value.
-| 512 ^7^
+| 512 ^[7]^
 
 |===
 [.small]