[BUG]Description for filter parameter among Role Assignments List Operations is incorrect

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/authorization/resource-manager/Microsoft.Authorization/stable/2022-04-01/authorization-RoleAssignmentsCalls.json#L684

### API Spec version

2022-04-01

### Describe the bug

The format mentioned for parameter filter in the description `principalId eq {id}` is actually not supported, which would made confusions to the users.
The correct format should be `principalId eq '{id}'`.

### Expected behavior

Update the words `$filter=principalId eq {id}` to `$filter=principalId eq '{id}'` in the description.

### Actual behavior


### Reproduction Steps

Call Role Assignments List Operations with parameter `$filter` in format `principalId eq {id}`, returned with error `The filter 'principalId eq xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' is not supported. Supported filters are either 'atScope()' or 'principalId eq '{value}' or assignedTo('{value}')'.`

### Environment

_No response_

Open specification/authorization/resource-manager/Microsoft.Authorization/stable/2022-04-01/authorization-RoleAssignmentsCalls.json at line 684 and inspect the filter parameter description. Compare it with the supported filter format shown in the issue; it is complete when the description uses the quoted principal ID form and the spec diff contains only that wording correction.

Written by the indexing model from the issue text.