docs: namespace ACL config typo fix (#22166)

typo fix

Author: boruszak

Diff for: website/content/docs/connect/config-entries/exported-services.mdx

@@ -788,7 +788,7 @@ partition "default" {
 }
 
 partition_prefix "" {
-  namespace_prefix "" {S
+  namespace_prefix "" {
     node_prefix "" {
       policy = "read"
     }