man: ip-l2tp.8: Fix BNF syntax

The 'ADDR' part of 'local' and 'remote' parameters is not optional, but
may also consist of the word 'any'. While at it, add missing whitespace
and fix fonts.
Signed-off-by: Phil Sutter <phil@nwl.cc>

man/man8/ip-l2tp.8

@@ -15,10 +15,7 @@ ip-l2tp - L2TPv3 static unmanaged tunnel configuration
 .ti -8
 .BR "ip l2tp add tunnel"
 .br
-.B remote
-.RI "[ " ADDR " ]"
-.B local
-.RI "[ " ADDR " ]"
+.BI remote " ADDR " local " ADDR "
 .br
 .B tunnel_id
 .IR ID
@@ -73,24 +70,21 @@ ip-l2tp - L2TPv3 static unmanaged tunnel configuration
 .IR ID
 .br
 .ti -8
-.BR "ip l2tp show tunnel"
-.B "[" tunnel_id
-.IR ID
-.B "]"
+.BR "ip l2tp show tunnel" " [ " tunnel_id
+.IR ID " ]"
 .br
 .ti -8
-.BR "ip l2tp show session"
-.B "[" tunnel_id
-.IR ID
-.B "] [" session_id
-.IR ID
-.B "]"
+.BR "ip l2tp show session" " [ " tunnel_id
+.IR ID .B " ] ["
+.B session_id
+.IR ID " ]"
 .br
 .ti -8
 .IR NAME " := "
 .IR STRING
 .ti -8
-.IR ADDR " := { " IP_ADDRESS " }"
+.IR ADDR " := { " IP_ADDRESS " |"
+.BR any " }"
 .ti -8
 .IR PORT " := { " NUMBER " }"
 .ti -8