Remove reference to yqArg in pipeline tutorial

In the source yaml https://github.com/GoogleContainerTools/skaffold/blob/master/examples/microservices/leeroy-web/kubernetes/deployment.yaml the yaml file changed and removed the first yaml doc for service. 
this change makes the tutorial fail. removing reference to yqArg since deployment.yaml has only one document now.

Author: moficodes

docs/tutorial.md

@@ -370,8 +370,6 @@ spec:
       params:
         - name: path
           value: /workspace/source/examples/microservices/leeroy-web/kubernetes/deployment.yaml #configure: may change according to your source
-        - name: yqArg
-          value: "-d1"
         - name: yamlPathToImage
           value: "spec.template.spec.containers[0].image"
 ```
@@ -395,11 +393,6 @@ spec:
       - name: path
         type: string
         description: Path to the manifest to apply
-      - name: yqArg
-        type: string
-        description:
-          Okay this is a hack, but I didn't feel right hard-coding `-d1` down
-          below
       - name: yamlPathToImage
         type: string
         description:
@@ -411,7 +404,6 @@ spec:
       args:
         - "w"
         - "-i"
-        - "$(inputs.params.yqArg)"
         - "$(inputs.params.path)"
         - "$(inputs.params.yamlPathToImage)"
         - "$(inputs.resources.image.url)"