docs: note DC-GAN combined backward fix (closes #418)

[sisird864]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Docs change / refactoring / dependency upgrade

Motivation and Context / Related issue

This PR closes issue [#418] by adding a note to examples/dcgan.py that the DC-GAN example now uses a single combined backward pass to avoid double-charging the privacy budget. This makes it clear to users and maintainers that the double‐charge bug has been addressed.

#418

How Has This Been Tested (if it applies)

Documentation only change; no code behavior altered.
Manually verified that the example still runs without errors under the usual settings.

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document and completed the CLA (see CONTRIBUTING).
• All tests passed, and additional code has been covered with new tests.

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[HuanyuZhang]

Noob question, it seems PR(#494) is on the fly, which means the problem has not been solved yet?

[iden-kalemaj]

@HuanyuZhang, PR #494 mentions PR #474 as solving the same issue with the privacy budget, so it seems the issue is indeed solved?