[Doc]: Get-AzRecoveryServicesBackupJob

### Description

In Get-AzRecoveryServicesBackupJob the parameter Operation doesn't offer the CrossRegionRestore value. This is somewhat confusing as the value Restore doesn't include cross region restore jobs. Best would be to add the value to the Operation, but it might also help to mention this in the documentation. Or add something like this:
Get-AzRecoveryServicesBackupJob -VaultId $VaultId -From ((Get-Date).AddDays(-29)).ToUniversalTime() | Where-Object {$_.Operation -eq 'CrossRegionRestore'}