Modify c-hat, atom-base doc

docs/en/base/btc_base.md

@@ -70,7 +70,7 @@
 
 ## Example
 
-### Arduino IDE
+### 1. Arduino
 
 [BTC2.1 & SHT30 Example](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/BTC/Arduino/BTC2.1)
 

docs/en/base/iiot_dual_switch_kit_with_core.md

@@ -63,11 +63,11 @@ For example, you can stack an IoT module such as LoRa, GSM, LTE, etc, in between
 
 ### Example 
 
-- **Arduino**
+### 1. Arduino
 
-Use with Arduino, please click [here](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/App/IIoT%20Dual)
+- [Click here to download the Arduino example](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/App/IIoT%20Dual)
 
-- **UIFlow**
+### 2. UIFlow
 
 <img src="assets/img/product_pics/base/iiot_dual_switch kit_with_core/IIOT_DUAL.webp" width="50%" height="50%">
 

docs/en/base/m5go_bottom2.md

@@ -137,9 +137,9 @@
 
 ## Example
 
-- **Arduino**
+### 1. Arduino
 
-Use with Arduino, please click [here](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/M5GO_BOTTOM2)
+- [Click here to download the Arduino example](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/M5GO_BOTTOM2)
 
 
 ## Schematic

docs/en/base/pm2.5.md

@@ -111,11 +111,11 @@ SHT20 is a Humidity and temperature sensor IC.
 
 ### Example 
 
-- **Arduino**
+### 1. Arduino
 
 *Use with Arduino, please click [here](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/PM2.5)*
 
-- **UIFlow**
+### 2. UIFlow
 
 <img src="assets/img/product_pics/base/PM2.5/pm2.5.webp">