ip man: Added short description for hsr link type

For hsr link there was no short description in ip-link man page.
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

man/man8/ip-link.8.in

@@ -171,6 +171,9 @@ Link types:
 .B dummy
 - Dummy network interface
 .sp
+.B hsr
+- High-availability Seamless Redundancy device
+.sp
 .B ifb
 - Intermediate Functional Block device
 .sp