chore: Deepspeed trainer docs

[MikhailKardash]

Ticket

None

Description

1. Add docs for deepspeed trainer
2. Fix a bug with the DCGAN example

Test Plan

Try DCGAN

Checklist

• Changes have been manually QA'd
• New features have been approved by the corresponding PM
• User-facing API changes have the "User-facing API Change" label
• Release notes have been added as a separate file under docs/release-notes/
  See Release Note for details.
• Licenses have been included for new code which was copied and/or modified from any external code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.46%. Comparing base (983a8ab) to head (66238ed).
Report is 10 commits behind head on scr-docs.

Additional details and impacted files

@@             Coverage Diff              @@
##           scr-docs   #10163      +/-   ##
============================================
+ Coverage     54.26%   58.46%   +4.20%     
============================================
  Files          1259      754     -505     
  Lines        157276   104292   -52984     
  Branches       3642     3641       -1     
============================================
- Hits          85344    60978   -24366     
+ Misses        71799    43181   -28618     
  Partials        133      133              

Flag	Coverage Δ
backend	43.80% <ø> (-2.11%)	⬇️
harness	71.15% <ø> (ø)
web	54.29% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
harness/determined/pytorch/deepspeed/_trainer.py	49.54% <ø> (ø)

... and 505 files with indirect coverage changes

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[MikhailKardash]

Closing, changes in this PR are included in #10182