docs: Update ares_set_local_dev man page (#886)

Binding to an interface does not require root since
c427bfec18

Fixes #405
Authored-By: Cristian Rodríguez (@crrodriguez)

docs/ares_set_local_dev.3

@@ -2,7 +2,7 @@
 .\" Copyright 2010 by Ben Greear <greearb@candelatech.com>
 .\" SPDX-License-Identifier: MIT
 .\"
-.TH ARES_SET_LOCAL_DEV 3 "30 June 2010"
+.TH ARES_SET_LOCAL_DEV 3 "23 September 2024"
 .SH NAME
 ares_set_local_dev \- Bind to a specific network device when creating sockets.
 .SH SYNOPSIS
@@ -15,12 +15,14 @@ void ares_set_local_dev(ares_channel_t *\fIchannel\fP, const char* \fIlocal_dev_
 The \fBares_set_local_dev\fP function causes all future sockets
 to be bound to this device with SO_BINDTODEVICE.  This forces communications
 to go over a certain interface, which can be useful on multi-homed machines.
-This option is only supported on Linux, and root privileges are required
-for the option to work.  If SO_BINDTODEVICE is not supported or the
-setsocktop call fails (probably because of permissions), the error is
+This option is only supported on Linux, the interface must not be already bound to the 
+socket or the current effective user must have CAP_NET_RAW capability in the current
+network namespace for the option to work.  If SO_BINDTODEVICE is not supported or the
+setsockopt call fails (probably because of permissions), the error is
 silently ignored.
 .SH SEE ALSO
 .BR ares_set_local_ip4 (3)
 .BR ares_set_local_ip6 (3)
+.BR network_namespaces (7)
 .SH NOTES
 This function was added in c-ares 1.7.4