Remove '--name' in faas-cli invoke

Doc can not execute. '--name' is removed.
see:https://github.com/openfaas/faas-cli/commit/e0973014146164fbefae3bbd34d644e921b2ae98#diff-6e522d40e6848a6eeeb12b0ab50cb97d



Signed-off-by: eiji.ienaga <eiji.ienaga@gmail.com>

guide/chaining_functions.md

@@ -18,8 +18,8 @@ $ curl -d "# test" localhost:8080/function/markdown | \
 You could also do this via code, or through the `faas-cli`:
 
 ```
-$ echo "test" | faas-cli invoke --name markdown | \
-faas-cli invoke --name slack
+$ echo "test" | faas-cli invoke markdown | \
+faas-cli invoke slack
 ```
 
 ## Server-side access via gateway

guide/deployment_k8s.md

@@ -89,8 +89,8 @@ Your function will appear after a few seconds and you can click "Invoke"
 You can also use the CLI like this:
 
 ```
-$ echo -n "" | faas-cli invoke --gateway http://kubernetes-ip:31112 --name nodeinfo
-$ echo -n "verbose" | faas-cli invoke --gateway http://kubernetes-ip:31112 --name nodeinfo
+$ echo -n "" | faas-cli invoke --gateway http://kubernetes-ip:31112 nodeinfo
+$ echo -n "verbose" | faas-cli invoke --gateway http://kubernetes-ip:31112 nodeinfo
 ```
 
 ## Asynchronous functions