Fix typo in Compute ImageDiskReference::id description

[wilsonge]

Note it exists in the historical versions of the spec too. But I'm just fixing the latest one as that's the one used in the public docs...

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[azuresdkci]

Can one of the admins verify this patch?

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[anuchandy]

@wilsonge thanks for the contribution.

@hyonholee while running CI for this PR, we came to know that the default package causes codegen to fail. See more info here #3968, please address the issue ASAP.

[hyonholee]

Please fix the following files too:

preview\2016-04-30-preview\disk.json
stable\2017-03-30\disk.json
stable\2018-04-01\disk.json

[wilsonge]

Fixed in the other files mentioned