Add Cloud Run - Traffic Splitting example (#3500) (#2062)

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/3500.txt

@@ -0,0 +1,2 @@
+```release-note:none
+```

website/docs/r/cloud_run_service.html.markdown

@@ -185,6 +185,37 @@ resource "google_cloud_run_service" "default" {
   autogenerate_revision_name = true
 }
 ```
+## Example Usage - Cloud Run Service Traffic Split
+
+
+```hcl
+resource "google_cloud_run_service" "default" {
+  name     = "cloudrun-srv"
+  location = "us-central1"
+
+  template {
+    spec {
+      containers {
+        image = "gcr.io/cloudrun/hello"
+      }
+    }
+    metadata {
+      name = "cloudrun-srv-green"
+    }
+  }
+
+  traffic {
+    percent       = 25
+    revision_name = "cloudrun-srv-green"
+  }
+
+  traffic {
+    percent       = 75
+    # This revision needs to already exist
+    revision_name = "cloudrun-srv-blue"
+  }
+}
+```
 
 ## Argument Reference