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docs: clarify half-boundary syntax for the -w/--word-regexp flag

docs: clarify half-boundary syntax for the -w/--word-regexp flag: a task in repo2rlenv-v083-pr diff (Harbor dataset). Title: docs: clarify half-boundary syntax for the -w/--word-regexp flag

The task

**Title:** docs: clarify half-boundary syntax for the -w/--word-regexp flag

Part of AdithyaSK/repo2rlenv-v083-pr_diff.