az network front-door create command is not accepting multiple fqdn backend adress

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**Describe the bug**
az network front-door create command is not accepting multiple FQDN with --backend-address parameters. It throw error as shown below
```
az network front-door create --resource-group resourcegroup--name contoso-frontend --accepted-protocols http https --backend-address webappcontoso-myRGFDCentral1.azurewebsites.net webappcontoso-myRGFDEast1.azurewebsites.net
unrecognized arguments: webappcontoso-myRGFDEast1.azurewebsites.net
```

**To Reproduce**
Run below command
```
az network front-door create --resource-group --name --accepted-protocols http https --backend-address
```

**Expected behavior**
It should accept multiple hostname
**Environment summary**
azure cloud shell bash
```
{
"azure-cli": "2.29.0",
"azure-cli-core": "2.29.0",
"azure-cli-telemetry": "1.0.6",
"extensions": {
"ai-examples": "0.2.5",
"front-door": "1.0.16",
"ssh": "0.1.6"
}
}
```
**Additional context**