GeoDR Link Deletion help do not show mandatory parameters

**Describe the bug**
The usage for az sql db replica delete-link shows that only –-partner-server is required, while instead also --server and –name and –resource-group (or –ids) are needed.

**To Reproduce**
az sql db replica delete-link --help

**Expected behavior**
--server and -name and --resource-group or --ids should be reported a required an not optional

**Environment summary**
```
Linux-4.4.0-18362-Microsoft-x86_64-with-debian-buster-sid
Python 3.6.5
Shell: bash

azure-cli 2.0.74
```