[docs] Fix docstring arguments that don't match the signatures

[revanth-045]

What does this PR do?

Four public docstrings describe parameters the functions don't accept (or a return type they don't produce), so the rendered API docs mislead callers:

Function	Docstring says	Signature has
TransformerSpatioTemporalModel.forward	num_frames (int)	(not a parameter — frames are inferred from image_only_indicator)
get_2d_rotary_pos_embed_lumina	grid (np.ndarray)	len_h, len_w (now documented)
AutoencoderKLHunyuanImageRefiner.tiled_decode	return_dict; returns DecoderOutput or tuple	(no return_dict; returns torch.Tensor)
AutoencoderKLHunyuanVideo15.tiled_decode	return_dict; returns DecoderOutput or tuple	(no return_dict; returns torch.Tensor)

Docstring-only; no behaviour changes. None of the touched blocks are # Copied from targets. ruff check, ruff format --check, and doc-builder style --check_only pass on the changed files.

Before submitting

• Did you read the contributor guideline?
• Did you write any new necessary tests? (docs only)

🤖 Generated with Claude Code

[github-actions]

Hi @revanth-045, thanks for the PR! It does not appear to link an issue it fixes. If this PR addresses an existing issue, please add a closing keyword (e.g. Fixes #1234) to the PR description so the issue is linked. See the contribution guide for more details. If this PR intentionally does not fix a tracked issue, a maintainer can add the no-issue-needed label to silence this reminder.

Please note that PRs without a linked issue are likely to be automatically closed 10 days after this notice.

Once the PR links an issue (or gets the no-issue-needed label), you can ignore this message — it stays here as a comment, but it no longer applies.

[stevhliu]

thanks!

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.