docs: fix --tp to --tp-size in specbundle SGLang flags

[imitater-dou]

Summary

In docs/community_resources/specbundle.md Usage prose, replace the stale SGLang flag --tp with --tp-size. Leave --ep and --mem-fraction-static unchanged.

Repro

Upstream docs currently say:

Please add --tp, --ep and --mem-fraction-static arguments when you encounter memory issues.

Against current SGLang ServerArgs:

• tp_size → CLI --tp-size (aliases: --tensor-parallel-size). There is no bare --tp.
• ep_size → --ep-size with alias --ep (kept as written).
• mem_fraction_static → --mem-fraction-static (kept as written).

python3 -c "from sglang.srt.server_args import ServerArgs; import dataclasses; f=[x for x in dataclasses.fields(ServerArgs) if x.name=='tp_size'][0]; print(f.name, f.type)"
# or:
python3 -m sglang.launch_server -h | grep -E -- '--tp-size|--tp[^-]|--ep |--mem-fraction-static'

--tp alone is rejected / not registered; --tp-size is the correct flag.

Test plan

• Confirmed prose-only one-line change in specbundle.md
• Distinct from open docs PRs docs: add --no-deps to ROCm install in training.md #796 / docs: fix stale --tp flag in bench SGLang examples #802 / docs: fix stale --tp flag in gates SGLang example #803 (different file/path)
• Docs render / review