rtl8168d: match 8169 device and add documentation

rtl8168d/config.toml

@@ -1,5 +1,5 @@
 [[drivers]]
 name = "RTL8168 NIC"
 class = 2
-ids = { 0x10ec = [0x8168] }
+ids = { 0x10ec = [0x8168, 0x8169] }
 command = ["rtl8168d", "$NAME", "$BAR2", "$BARSIZE2", "$IRQ"]

rtl8168d/src/device.rs

@@ -1,3 +1,6 @@
+// Supports Realtek RTL8168, RTL8169, and other compatible devices
+// See https://people.freebsd.org/~wpaul/RealTek/rtl8169spec-121.pdf
+
 use std::mem;
 use std::collections::BTreeMap;