Fix formatting of ip.8 family man page

fix bad formatting in description of -f option

man/man8/ip.8

@@ -52,8 +52,8 @@ Zero (0) means loop until all addresses are removed.
 followed by protocol family identifier:
 .BR "inet" , " inet6"
 or
-.B link
-,enforce the protocol family to use.  If the option is not present,
+.BR link ,
+enforce the protocol family to use.  If the option is not present,
 the protocol family is guessed from other arguments.  If the rest
 of the command line does not give enough information to guess the
 family,