git: f5cf173de0dc - main - kill.1: mention special PID 0

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=f5cf173de0dc62dbf47a8bbdcae28aac947d90a6

commit f5cf173de0dc62dbf47a8bbdcae28aac947d90a6
Author:     artembunichev <artembunichev@zohomail.com>
AuthorDate: 2025-01-19 12:49:14 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2025-01-19 13:29:27 +0000

    kill.1: mention special PID 0
    
    PR:      284158
    MFC after:      3 days
---
 bin/kill/kill.1 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/bin/kill/kill.1 b/bin/kill/kill.1
index ce9cb06382f8..02357ff60c19 100644
--- a/bin/kill/kill.1
+++ b/bin/kill/kill.1
@@ -79,6 +79,9 @@ of the default
 .Pp
 The following PIDs have special meanings:
 .Bl -tag -width indent
+.It 0
+The signal is sent to all processes whose group ID is equal to the process
+group ID of the sender, and for which the process has permission.
 .It -1
 If superuser, broadcast the signal to all processes; otherwise broadcast
 to all processes belonging to the user.