https://git.ruby-lang.org/ruby.git/commit/?id=56b90cf944

From 56b90cf94465ce347a3d9a779363c78ce3deb180 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Wed, 10 Nov 2021 14:09:08 +0900
Subject: Fix a typo and add `IO.` [ci skip]

---
 NEWS.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/NEWS.md b/NEWS.md
index 7ff8a7d5c20..05e2d41eb99 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -160,7 +160,7 @@ Outstanding ones only. https://github.com/ruby/ruby/blob/trunk/NEWS.md#L160
 
     * Process.\_fork is added. This is a core method for fork(2).
       Do not call this method directly; it is called by existing
-      fork methods: Kernel.#fork, Process.fork, and popen("=").
+      fork methods: Kernel.#fork, Process.fork, and IO.popen("-").
       Application monitoring libraries can overwride this method to
       hook fork event. [[Feature #17795]]
 
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