Fix the DCGAN C++ shape warning

[LiAuTraver]

The issue in example repo has been fixed but on website it did not update. I found it today while following the tutorials.

Issue see here, main code repo PR: here.

This PR adopted the solution mentioned in the issue and tested with the latest version libtorch(current 2.5.1) with cuda 12.6.

cc @albanD @jbschlosser

[pytorch-bot]

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[albanD]

Sounds fair !
A squeeze(1) would also be ok here if we need the broadcasting to happen in the loss