https://git.ruby-lang.org/ruby.git/commit/?id=01d9e7f26c

From 01d9e7f26cc58dd280f0a08f0d12b7e7b7424147 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 30 Jul 2021 19:20:09 +0900
Subject: [DOC] Fix Process::exec documentation [ci skip]

The environment variable `RUBYSHELL` is used only on Windows, as
well as `COMSPEC`.
---
 process.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/process.c b/process.c
index fa8c69d..7f91b8c 100644
--- a/process.c
+++ b/process.c
@@ -3148,8 +3148,8 @@ NORETURN(static VALUE f_exec(int c, const VALUE *a, VALUE _)); https://github.com/ruby/ruby/blob/trunk/process.c#L3148
  *  shell expansion before being executed.
  *
  *  The standard shell always means <code>"/bin/sh"</code> on Unix-like systems,
- *  same as <code>ENV["RUBYSHELL"]</code>
- *  (or <code>ENV["COMSPEC"]</code> on Windows NT series), and similar.
+ *  otherwise, <code>ENV["RUBYSHELL"]</code> or <code>ENV["COMSPEC"]</code> on
+ *  Windows and similar.
  *
  *  If the string from the first form (<code>exec("command")</code>) follows
  *  these simple rules:
-- 
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