Add vertical whitespace and google.rpc.Help.Link output

[modular-magician]

Output repeated google.rpc.Help.Link "description" and "url".

For Compute Operation errors, add vertical whitespace between the Error message the LocalizedMessage.message and each Help.Link "description" and "url".

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compute: added support documentation links to error messages for certain Compute Operation errors.

Derived from GoogleCloudPlatform/magic-modules#6454