🤖 Auto-sync docs, metadata, and filepaths

Author: github-actions[bot]

exercises/practice/grep/.docs/introduction.md

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+# Introduction
+
+You have taken a job at a local library helping organize their collection of old books.
+The student patrons are often hunting for half-remembered quotes to cite in their term papers.
+Rather than manually read every book from cover to cover, you decide to build a small tool to scan them, looking for these partial quotes.