Update BoAT_User_Guide_en.md
change "linux" to "Linux" ; change "cygwin" to "Cygwin".
@@ -33,12 +33,12 @@ Hyperledger Fabric
**Supported Target Operating System:**
-linux
+Linux
RTOS
**Supported Build Operating System:**
-linux/cygwin
+Linux/Cygwin
**Main features:**
Blockchain account (wallet) parameter configuration
