fix syntax highlihgt

docs/en/api/gpio.md

@@ -15,7 +15,7 @@ Return:
     digital level(0/1)
 
 **Example**
-```c++
+```arduino
 uint32_t pin21_data;
 pin21_data = digitalRead(21);
 ```

docs/en/api/speaker.md

@@ -10,6 +10,6 @@ Set the pitch of speaker.
 | freq | <code>uint32_t</code> | frequency |
 
 **Example**
-```c++
+```arduino
 M5.Speaker.tone(100);
 ```

docs/en/module/lora.md

@@ -46,7 +46,7 @@ account the distance, anti-interference and power consumption
 ?> **Note** If your board LCD can't display or has some other problem, we suggest
 you to add the two statements code followed by ``m5.begin();`` as shown
 below
-```cpp
+```arduino
     pinMode(5,OUTPUT);
     digitalWrite(5,HIGH);
     m5.begin();

docs/en/module/servo.md

@@ -41,7 +41,7 @@ Servo is communicated with M5Core through GROVE interface(I2C communication). Th
 
 ### 1. Arduino IDE
 
-```c++
+```arduino
 #define SERVO_ADDR 0x53 //the IIC address of SERVO Module
 /*
  * control servo(CH channle) by us

docs/en/module/sim800.md

@@ -66,7 +66,7 @@ your own.npm i docsify-cli -g
 
 Here's a example using SIM800 for sending SMS
 
-```c++
+```arduino
 /*
 * Master.ino
 */

docs/en/quick_start/m5core/m5stack_core_get_started_Arduino_Windows.md

@@ -77,7 +77,7 @@ Open Arduino IDE, then new a `.ino` file, rename it as `my_test.ino`
 
 Copy the below code to my_test.ino
 
-```cpp
+```arduino
 #include <M5Stack.h>
 
 // the setup routine runs once when M5Stack starts up

docs/en/unit/adc.md

@@ -35,7 +35,7 @@ This is a unit having self-calibrating function and 16bit analog-to-digitial cov
 
 ## Example
 
-```c++
+```arduino
 ADS1100 ads;//new a object
 ads.getAddr_ADS1100(0x48);//ADS1100_DEFAULT_ADDRESS: 0x48
 

docs/en/unit/angle.md

@@ -26,7 +26,7 @@ angle.
 
 ### 1. Arduino IDE
 
-```c++
+```arduino
 #include <M5Stack.h>
 // select the input pin for the potentiometer
 int sensorPin = 36;

docs/en/unit/button.md

@@ -23,7 +23,7 @@ The Unit BUTTON is a sigle-button unit that can be detected whether the button p
 
 ## Example
 
-```c++
+```arduino
 float tmp = dht12.readTemperature();//temperature
 float hum = dht12.readHumidity();//humidity
 float pressure = bme.readPressure();//pressure

docs/en/unit/color.md

@@ -33,7 +33,7 @@ This is a unit can detecte the color of object surface which integrates TCS3472
 ## Example
 ### 1. Arduino IDE
 
-```c++
+```arduino
 Adafruit_TCS34725 tcs;
 
 tcs = Adafruit_TCS34725(TCS34725_INTEGRATIONTIME_50MS, TCS34725_GAIN_4X);

docs/en/unit/dac.md

@@ -33,7 +33,7 @@ This is a unit can convert digital signal to analog signal like voltage waveform
 ## Example
 ### 1. Arduino IDE
 <!--
-```c++
+```arduino
 /*
     hardware : m5stack uint dac
     please install adafruit MCP4725 lib

docs/en/unit/earth.md

@@ -27,7 +27,7 @@ You can read the moisture in soil staright or get a digital signal(0/1) that mea
 ## Example
 ### 1. Arduino IDE
 
-```c++
+```arduino
 //disable the speak noise
 dacWrite(25, 0);
 

docs/en/unit/env.md

@@ -35,7 +35,7 @@ temperature and humidity sensor and absolute barometric pressure sensor. Connect
 
 ## Example
 
-```c++
+```arduino
 float tmp = dht12.readTemperature();//temperature
 float hum = dht12.readHumidity();//humidity
 float pressure = bme.readPressure();//pressure

docs/en/unit/esp32cam.md

@@ -64,7 +64,7 @@ The ESP32Cam equips the ESP32 with everything necessary to program, run and deve
 
 ## Example
 
-<!-- ```c++
+<!-- ```arduino
 float tmp = dht12.readTemperature();//temperature
 float hum = dht12.readHumidity();//humidity
 float pressure = bme.readPressure();//pressure

docs/en/unit/ir.md

@@ -35,7 +35,7 @@ same time signal output interface to output digital signal.
 
 ### 1. Arduino IDE
 
-```c++
+```arduino
 #include <M5Stack.h>
 // select the input pin for the potentiometer
 int ir_recv_pin = 36;

docs/en/unit/joystick.md

@@ -25,7 +25,7 @@ This Unit is a joystick unit the same as game controller button that can be dete
 
 ### 1. Arduino IDE
 
-```c++
+```arduino
 #define JOY_ADDR 0x52
 
 //disable the speak noise

docs/en/unit/light.md

@@ -29,7 +29,7 @@ You can read analog signal(lightironmental light intensity) staright or get a di
 
 ### 1. Arduino IDE
 
-```c++
+```arduino
 //disable the speak noise
 dacWrite(25, 0);
 

docs/en/unit/m5camera.md

@@ -64,7 +64,7 @@ The M5Camera equips the ESP32 with everything necessary to program, run and deve
 
 ## Example
 
-<!-- ```c++
+<!-- ```arduino
 float tmp = dht12.readTemperature();//temperature
 float hum = dht12.readHumidity();//humidity
 float pressure = bme.readPressure();//pressure

docs/en/unit/makey.md

@@ -31,7 +31,7 @@ The Unit makey is a makey unit with 16 touchable pins.The Unit makey is based on
 
 ## Example
 
-<!-- ```c++
+<!-- ```arduino
 float tmp = dht12.readTemperature();//temperature
 float hum = dht12.readHumidity();//humidity
 float pressure = bme.readPressure();//pressure

docs/en/unit/ncir.md

@@ -32,7 +32,7 @@ This is a unit can measure body temperature or be applicated for movement detect
 
 ## Example
 
-<!-- ```c++
+<!-- ```arduino
 float tmp = dht12.readTemperature();//temperature
 float hum = dht12.readHumidity();//humidity
 float pressure = bme.readPressure();//pressure