re(4), rge(4): improve Realtek driver man pages

Add D-Link DGE-530(T) and Killer E2600 to the re(4) HARDWARE list.
Both are supported by the driver but were missing from the man page.

Also add cross-references between re(4) and rge(4) in SEE ALSO,
as both are Realtek NIC drivers.

Signed-off-by: Christos Longros <chris.longros@gmail.com>

Reviewed by:	adrian
Differential Revision:	https://reviews.freebsd.org/D55745

share/man/man4/re.4

@@ -155,6 +155,10 @@ Corega CG-LAPCIGT Gigabit Ethernet (8169S)
 .It
 D-Link DGE-528(T) Gigabit Ethernet (8169S)
 .It
+D-Link DGE-530(T) Gigabit Ethernet (8169S)
+.It
+Killer E2600 Gigabit Ethernet (8168)
+.It
 Gigabyte 7N400 Pro2 Integrated Gigabit Ethernet (8110S)
 .It
 LevelOne GNC-0105T (8169S)
@@ -237,6 +241,7 @@ the network connection (cable).
 .Xr netintro 4 ,
 .Xr ng_ether 4 ,
 .Xr polling 4 ,
+.Xr rge 4 ,
 .Xr rgephy 4 ,
 .Xr vlan 4 ,
 .Xr ifconfig 8

share/man/man4/rge.4

@@ -146,6 +146,7 @@ the network connection (cable).
 .Xr netintro 4 ,
 .Xr ng_ether 4 ,
 .Xr polling 4 ,
+.Xr re 4 ,
 .Xr vlan 4 ,
 .Xr ifconfig 8
 .Rs