Add inline patching to kubectl update.

docs/kubectl.md

@@ -236,6 +236,9 @@ Examples:
 
   $ cat pod.json | kubectl update -f -
   <update a pod based on the json passed into stdin>
+  
+  $ kubectl update pods my-pod --patch='{ "labels": { "foo": "bar" } }'
+  <update a pod by downloading it, applying the patch, then updating>
 
 Usage:
 ```
@@ -261,6 +264,7 @@ Usage:
       --match-server-version=false: Require server version to match client version
   -n, --namespace="": If present, the namespace scope for this CLI request.
       --ns-path="/home/username/.kubernetes_ns": Path to the namespace info file that holds the namespace context to use for CLI requests.
+      --patch="": A JSON document to override the existing resource.  The resource is downloaded, then patched with the JSON, the re-updated
   -s, --server="": The address of the Kubernetes API server
       --stderrthreshold=2: logs at or above this threshold go to stderr
       --token="": Bearer token for authentication to the API server.