Update SUMMARY.md

"eBook/chapter9/09.2.2md" -> "eBook/chapter9/09.2.2.md"
dudefu · Sep 7, 2020 · b61804d · b61804d
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Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/SUMMARY.md b/SUMMARY.md
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     * [09.1.2 并发与并行](eBook/chapter9/09.1.2.md)
   * [09.2 Goroutines](eBook/chapter9/09.2.md)
     * [09.2.1 创建一个Goroutine](eBook/chapter9/09.2.1.md)
-    * [09.2.2 创建多个Goroutine](eBook/chapter9/09.2.2md)
+    * [09.2.2 创建多个Goroutine](eBook/chapter9/09.2.2.md)
   * [09.3 优雅地结束goroutines](eBook/chapter9/09.3.md)
     * [09.3.1 当Add()和Done()的数量不匹配时会发生什么？](eBook/chapter9/09.3.1.md)
   * [09.4 Channel(通道)](eBook/chapter9/09.4.md)