[Toybox] [PATCH] setsid: document -w.

[enh]

-w was added recently. The change in behavior so we now always fork
means that it's needed in more cases too: other implementations of
setsid(1) only fork if getpgrp() != getpid(). This broke a script, which
is what made me notice the missing help.

This seems to have been an accidental change, and is contrary to what
the util-linux setsid(1) man page says: "The command calls fork(2) if
already a process group leader.  Otherwise, it executes a program
in the current process", but whether we change our behavior or not, we
should document the new option.
---
 toys/other/setsid.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/toys/other/setsid.c b/toys/other/setsid.c
index 57a926ef..70672424 100644
--- a/toys/other/setsid.c
+++ b/toys/other/setsid.c
@@ -14,6 +14,7 @@ config SETSID

     -d Detach from tty
     -c Control tty (become foreground process & receive keyboard signals)
+    -w Wait for child (and exit with its status)
 */

 #define FOR_setsid
-- 
2.25.0.rc1.283.g88dfdc4193-goog
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