Docs: fix typos across Hub markdown and examples

[arvindcr4]

This PR fixes multiple small typos and grammar issues across the Hub documentation pages.

• ResNeXt page: correct title casing and description (ResNeXt, architecture, respectively)
• NVIDIA example docs: recipes, pronunciation, synthesize wording
• Vision docs: palette/auxiliary and minor phrasing fixes
• ProxylessNAS: available, parallelization
• Open-Unmix: output/Resources
• Test harness comments: checkpoints, torchvision, torchhub

Documentation-only changes; no functional code paths affected.

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[Copilot]

Pull Request Overview

This PR fixes multiple typos and grammar issues across Hub documentation pages to improve readability and correctness.

• Corrects spelling errors in comments, variable names, and documentation text
• Fixes grammar and word choice issues in markdown files
• Standardizes terminology and formatting across documentation

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test_run_python_code.py	Fixes spelling errors in test comments (checkpoints, torchvision, torchhub)
sigsep_open-unmix-pytorch_umx.md	Corrects "ouput" to "output" and "Ressources" to "Resources"
pytorch_vision_resnext.md	Fixes title casing, grammar, and terminology consistency
pytorch_vision_proxylessnas.md	Corrects "avaliable" to "available" and "parallization" to "parallelization"
pytorch_vision_once_for_all.md	Fixes "evalutaed" to "evaluated"
pytorch_vision_googlenet.md	Corrects "list" to "listed"
pytorch_vision_fcn_resnet101.md	Fixes "auxillary" to "auxiliary" and "pallette" to "palette"
pytorch_vision_deeplabv3_resnet101.md	Fixes "pallette" to "palette"
nvidia_deeplearningexamples_*.md	Corrects multiple instances of "recipies" to "recipes", "pronounciation" to "pronunciation", and "synthetize/syntesize" to "synthesize"
facebookresearch_semi-supervised-ImageNet1K-models_resnext.md	Fixes "ingored" to "ignored"

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