docs: Fix a step time number for deepseek

[guyueh1]

What does this PR do ?

Fix one step time result in perf table for v0.5.

Issues

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Summary by CodeRabbit

• Documentation
  • Fixed an incorrect performance metric value in the performance summary documentation to ensure data accuracy.

[coderabbitai]

📝 Walkthrough

Walkthrough

A single-line data correction in a performance benchmark table fixes the DAPO DeepSeek V3 On policy row's Total Step time value from 974 to 458 and corrects the line's formatting to align with the table structure.

Changes

Cohort / File(s)	Summary
Documentation & Benchmarking Table docs/about/performance-summary.md	Corrected DAPO DeepSeek V3 On policy row: fixed Total Step time metric value from 974 to 458 and reformatted line to start with pipe character for proper table alignment.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• docs: v0.5 performance results update #1772: Both PRs modify the same performance-summary.md benchmarking table with updates to DAPO/DeepSeek row entries.
• cp: docs: v0.5 performance results update (1772) into r0.5.0 #1800: Both PRs make corrections to the same DeepSeek V3 performance table content in performance-summary.md.

Suggested labels

CI:docs

Suggested reviewers

• terrykong
• snowmanwwg

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: fixing a step time number in documentation for deepseek, which directly matches the single data entry correction in the performance table.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Test Results For Major Changes	✅ Passed	This PR is a minor documentation-only fix correcting a single metric value with no code modifications, features, or breaking changes.

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