update d/datasource_compute_network documentation

[jeet-parekh]

Changed the network attribute to id inside the d/datasource_compute_network documentation.
https://www.terraform.io/docs/providers/google/d/datasource_compute_network.html

Fixes #5623.

[nat-henderson]

Thanks for the change - it seems to me that the parent network info isn't in the resource at all, so I'll delete this line instead.

[ghost]

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