Fix typo in comment (closes #588)

Thank you @qqq89513

src/modbus.c

@@ -1139,7 +1139,7 @@ int modbus_read_input_bits(modbus_t *ctx, int addr, int nb, uint8_t *dest)
         return nb;
 }
 
-/* Reads the data from a remove device and put that data into an array */
+/* Reads the data from a remote device and put that data into an array */
 static int read_registers(modbus_t *ctx, int function, int addr, int nb,
                           uint16_t *dest)
 {