Dereference lem(4), no longer in 13-CURRENT.

While here, fix formatting of inline parenthesis and Xrs.

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share/man/man4/netmap.4

@@ -27,7 +27,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 26, 2019
+.Dd November 8, 2019
 .Dt NETMAP 4
 .Os
 .Sh NAME
@@ -828,7 +828,7 @@ On
 .Xr cxgbe 4 ,
 .Xr em 4 ,
 .Xr iflib 4
-(providing igb, em and lem),
+.Pq providing Xr igb 4 and Xr em 4 ,
 .Xr ixgbe 4 ,
 .Xr ixl 4 ,
 .Xr re 4 ,