Incorrect example for 'vm availability-set create'

[derekbekoe]

Environment summary

Install Method: How did you install the CLI? (e.g. pip, interactive script, apt-get, Docker, MSI, nightly)
Answer here: Dev install

CLI Version: What version of the CLI and modules are installed? (Available with az --version)
Answer here:

azure-cli (2.0.2+dev)

acr (2.0.0+dev)
acs (2.0.2+dev)
appservice (0.1.2+dev)
batch (2.0.0+dev)
cloud (2.0.0+dev)
component (2.0.0+dev)
configure (2.0.2+dev)
container (0.1.2+dev)
core (2.0.2+dev)
dla (0.0.1+dev)
dls (0.0.1+dev)
documentdb (0.1.2+dev)
feedback (2.0.0+dev)
find (0.0.1b1+dev)
iot (0.1.2+dev)
keyvault (2.0.0+dev)
lab (0.0.1+dev)
monitor (0.0.1+dev)
network (2.0.2+dev)
nspkg (2.0.0+dev)
profile (2.0.2+dev)
redis (0.1.1b3+dev)
resource (2.0.2+dev)
role (2.0.1+dev)
sql (2.0.0+dev)
storage (2.0.2+dev)
taskhelp (0.1.1b4+dev)
testsdk (0.1.0+dev)
utility-automation (0.1.1)
vm (2.0.2+dev)

OS Version: What OS and version are you using?
Answer here: macOS

Shell Type: What shell are you using? (e.g. bash, cmd.exe, PowerShell)
Answer here: Bash

Description

$ az vm availability-set create -h
Arguments
    --name -n                      [Required]: Name of the availability set.
    --platform-fault-domain-count  [Required]: Fault Domain count. Example: 2.
    --platform-update-domain-count [Required]: Update Domain count. Example: 2.
    --resource-group -g            [Required]: Name of resource group. You can configure the default
                                               group using 'az configure --defaults group=<name>'.

Examples
    Create an availability set.
        az vm availability-set create -n MyAvSet -g MyResourceGroup

4 params are required but the example only has 2 params.