HF RL Explorer

corrected syntax errors and typos found in README.md of bleu metric

corrected syntax errors and typos found in README.md of bleu metric: a task in repo2rlenv-v083-pr diff (Harbor dataset). Title: corrected syntax errors and typos found in README.md of bleu metric

The task

**Title:** corrected syntax errors and typos found in README.md of bleu metric

Part of AdithyaSK/repo2rlenv-v083-pr_diff.