[Docs] GSM8K Accuracy Evaluation doc update

[david6666666]

Purpose

fix gsm8k eval doc

Run standalone evaluation script

# Start vLLM server first
vllm serve Qwen/Qwen2.5-1.5B-Instruct --port 8000

# Run evaluation
python tests/evals/gsm8k/gsm8k_eval.py --port 8000

Test Plan

Test Result

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[gemini-code-assist]

Code Review

This pull request updates a command in the README.md for the GSM8K evaluation, correcting the path to the gsm8k_eval.py script. The change is a good improvement. I've added a suggestion to use python3 explicitly to avoid potential issues on systems where python might refer to Python 2. Additionally, please note that the path in the pytest command on line 10 of the same README file also appears to be incorrect and could be fixed for consistency.

[gemini-code-assist]

The associated script gsm8k_eval.py uses a python3 shebang (#!/usr/bin/env python3). To ensure this command runs reliably across different user environments, it's best practice to use python3 explicitly. On some systems, python may still point to an older, incompatible Python 2 installation, which would cause the script to fail.

Suggested change

	python tests/evals/gsm8k/gsm8k_eval.py --port 8000
	python3 tests/evals/gsm8k/gsm8k_eval.py --port 8000