update

src/docs/asciidoc/BPI-H618_pre-edit_EN.adoc

@@ -182,7 +182,7 @@ If attached downstream devices consume less than 500mA or none device, a 5V@2A s
 
 The USB Type-C sockets provide USB 2.0 OTG, with integrated USB 2.0 analog PHY.
 
-Compatible with USB2.0 Specification.
+Compatible with USB 2.0 Specification.
 
 Supports High-Speed (HS, 480 Mbit/s), Full-Speed (FS, 12 Mbit/s) and Low-Speed (LS, 1.5 Mbit/s) in host mode.
 
@@ -257,3 +257,37 @@ Use 3.5mm To 3 RCA Cable to get the TV CVBS output.
 
 Supports NTSC and PAL mode, plug status auto detecting.
 
+=== 3.9 Buttons
+
+*RESET Button*, reset when pressed.
+
+*FEL Button*, boot select button, when press it and hold it down, then reset the board, the board will enter into the mandatory upgrade process.
+
+*USER Button*, user-programmable button, when pressed, GPIO PC7 will get low level, otherwise it will get a high level.
+
+All buttons are equipped with ESD electrostatic protection.
+
+=== 3.10 Ethernet
+
+Provides a Gigabit Ethernet RJ45 port.
+
+Compliant with IEEE 802.3-2002 standard.
+
+Supports both full-duplex and half-duplex operation.
+
+Supports PoE with add-on PoE HAT.
+
+=== 3.11 WiFi & Bluetooth
+
+Provides 2.4G/5G WiFi and Bluetooth 4.2 via an WIFI+BT Combo Module.
+
+Connect the antenna via IPEX-1 RF connector.
+
+* 2.4G WIFI:2.412~2.472GHz
+* 5G WIFI:5.18~5.24GHz/5.745~5.825GHz
+* BT:2.402~2.48GHz
+* IEEE 802.11a/b/g/n/ac(1T1R)
+* Wireless data rate can reach up to 433.3Mbps 
+* Bluetooth Low Energy Support 
+
+