Backport of Fix typo in permissive mTLS docs into release/1.16.x (#18589

)

backport of commit 3458b3e

Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>
Co-authored-by: trujillo-adam <47586768+trujillo-adam@users.noreply.github.com>

website/content/docs/k8s/connect/onboarding-tproxy-mode.mdx

@@ -58,7 +58,8 @@ kind: Mesh
 metadata:
   name: mesh
 spec:
-  allowEnablingPermissiveMutualTLS: true
+  transparentProxy:
+    meshDestinationsOnly: true
 ```
 
 ```json
@@ -292,4 +293,4 @@ $ consul config read -kind proxy-defaults -name global
     "CreateIndex": 26,
     "ModifyIndex": 30
 }
-```
+```