Update chapter_2_1.md

X-lab2017 · Aug 2, 2024 · 5b9003e · 5b9003e
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diff --git a/docs/textbook/chapter_2/chapter_2_1.md b/docs/textbook/chapter_2/chapter_2_1.md
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-title: 2.1
+title: 开源（open source）
 tags:
   - 开源 open source
   - 开源软件