man ip: Add missing '-details' option

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>

man/man8/ip.8

@@ -58,6 +58,10 @@ Output more information.  If the option
 appears twice or more, the amount of information increases.
 As a rule, the information is statistics or some time values.
 
+.TP
+.BR "\-d" , " \-details"
+Output more detailed information.
+
 .TP
 .BR "\-l" , " \-loops " <COUNT>
 Specify maximum number of loops the 'ip addr flush' logic