az role assignment create - issue

[1.txt](https://github.com/Azure/azure-cli/files/5415607/1.txt)

### **This is autogenerated. Please review and update as needed.**

## Describe the bug

**Command Name**
`az role assignment create`

**Errors:**
```
ArgumentParseError: argument --resource-group/-g: expected one argument
```

## To Reproduce:
Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

- _Put any pre-requisite steps here..._
- `az role assignment create --roleName {} --signInName -–{} {} --resource-type {} --resource-group`

## Expected Behavior

## Environment Summary
```
Linux-4.15.0-1098-azure-x86_64-with-debian-stretch-sid (Cloud Shell)
Python 3.6.10
Installer: DEB

azure-cli 2.13.0

Extensions:
ai-examples 0.2.4

```
## Additional Context