Update Remove-AzureRmVMDiagnosticsExtension.md

[yantang-msft]

Update the incorrect PS command example

Description

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[cormacpayne]

@yantang-msft the description below says:

The command passes the result to the Update-AzureRmVM cmdlet by using the pipeline operator. That command updates the virtual machine.

Any reason why you want to remove the piping to the Update-AzureRmVM cmdlet?

[yantang-msft]

The remove command itself is enough. Update-AzureVM is needed for V1 vm, but not V2 vm. Running the current sample command will give such error:
Update-AzureRmVM : The input object cannot be bound to any parameters for the command either because the command does not take pipeline input or the input and its properties do not match any of the
parameters that take pipeline input.

[cormacpayne]

@singhkays Hey Kay, would you mind taking a look at this pull request? I'm not sure if the examples needs to be updated or not - it looks good in its current state, in my opinion.

Verified that piping to update is unnecessary