managementPolicies: Name has to be "default"

### Resource Type

Microsoft.Storage/storageAccounts/managementPolicies

### Api Version

2023-05-01

### Issue Type

Inaccurate/confusing description(s)

### Other Notes

It is not obvious from the [documentation](https://learn.microsoft.com/en-us/azure/templates/microsoft.storage/storageaccounts/managementpolicies?pivots=deployment-language-bicep#storageaccountsmanagementpolicies) that the resource name has to be default and could not be changed.

```bicep
resource symbolicname 'Microsoft.Storage/storageAccounts/managementPolicies@2023-05-01' = {
name: 'default'
parent: resourceSymbolicName
properties: {
}
}
```

### Bicep Repro

_No response_

### Confirm

- [x] I have read the troubleshooting guide and looked for duplicates.

Review the linked Microsoft.Storage/storageAccounts/managementPolicies documentation for the 2023-05-01 resource type and compare it with the Bicep example in the issue. Clarify that the resource name must be "default" and verify the published documentation shows this constraint clearly.

Written by the indexing model from the issue text.