fixes #3656 (#3657)

* fixes #3656

* add latest correctly, route still doesn't work though

docs/getting-started/first-traffic-split.md

@@ -23,8 +23,8 @@ Instead of `TARGET`="World," let's update the environment variable `TARGET` on o
     ```
 
 === "YAML"
-
     ``` bash
+    ---
     apiVersion: serving.knative.dev/v1
     kind: Service
     metadata:
@@ -32,7 +32,7 @@ Instead of `TARGET`="World," let's update the environment variable `TARGET` on o
     spec:
       template:
         metadata:
-          name: knative
+          name: hello-knative
         spec:
           containers:
             - image: gcr.io/knative-samples/helloworld-go
@@ -107,18 +107,19 @@ By default, when Knative creates a brand new `Revision` it directs 100% of traff
     ```
 
 === "YAML"
-
+    Add the following to the bottom of your existing YAML file:
     ``` bash
+    ---
     apiVersion: serving.knative.dev/v1
     kind: Route
     metadata:
-      name: route-hello
+      name: hello
     spec:
       traffic:
-      - revisionName: @latest
+        - revisionName: latest
-      - percent: 50
+          percent: 50
-      - revisionName: hello-world
+        - revisionName: hello-world
-        percent: 50
+          percent: 50
     ```
     Once you've edited your existing YAML file:
     ``` bash