fix bugs

docs/en/product_documents.md

@@ -1,6 +1,8 @@
 # Product Documents
 
-[中文](zh_CN/product_documents_zh_CN.md) | English | [日本語](ja/product_documents.md)
+[中文](zh_CN/product_documents.md) | English | [日本語](ja/product_documents.md)
+
+## Cores
 
 <img src='assets/img/product_pics/1.jpg'> <img src='assets/img/product_pics/cores.png'>
 
@@ -10,7 +12,7 @@
 | [GRAY](en/product_documents/m5stack-core/m5core_gray)          | /            |
 | [FIRE](en/product_documents/m5stack-core/m5core_fire)          | /            |
 
-
+## Modules
 
 <img src='assets/img/product_pics/2.jpg'> <img src='assets/img/product_pics/module.png'>
 
@@ -26,20 +28,24 @@
 | /                     | /                  | /                     |
 | /                     | /                  | /                     |
 
+## Bases
+
 <img src='assets/img/product_pics/5.jpg'> <img src='assets/img/product_pics/bases.png'>
+
 - [M5GO-Base](en/product_documents/bases/cables/m5go_base)
 - [PLC-Base](en/product_documents/modules/module_plc)
 - [FACE-Base](en/product_documents/modules/module_face)
 - [LAN](en/product_documents/bases/lan_base)
 - [Node-Base](en/product_documents/bases/node_base)
 
+## Accessories
 
 <img src='assets/img/product_pics/5.jpg'> <img src='assets/img/product_pics/accessory.png'>
 
 - [LEGO-CABLE](en/product_documents/accessorries/cables/accessory_lego_cable)
 - [FRAME](en/product_documents/accessorries/accessory_frame)
 
-
+## Units
 
 <img src='assets/img/product_pics/3.jpg'> <img src='assets/img/product_pics/unit.png'>
 
@@ -63,12 +69,13 @@
 | [ESP32Cam](en/product_documents/units/unit_esp32cam)                   | /                         | /                 |
 | [M5Camera](en/product_documents/units/unit_m5camera)                   | /                         | /                 |
 
-
+## Applications
 
 <img src='assets/img/product_pics/4.jpg'> <img src='assets/img/product_pics/application.png'>
 
 - [BALA](en/product_documents/applications/application_bala)
 
+## Tools
 
 <img src='assets/img/product_pics/6.jpg'> <img src='assets/img/product_pics/tool.png'>
 

docs/en/product_documents/units/unit_color_sensor.md

@@ -30,5 +30,5 @@ This is a unit can detecte the color of object surface which integrates TCS3472
 -  [Purchase](https://www.aliexpress.com/store/product/M5Stack-Official-Color-Unit-TCS34725-Color-Sensor-RGB-Color-Sensor-Development-Board-Module-GROVE-I2C-Compatible/3226069_32946957647.html?spm=a2g1x.12024536.productList_5885013.pic_5)
 
 <figure>
-    <img src="assets/img/product_pics/units/M5GO_Unit_ncir.png" height="300" width="300">
+    <img src="assets/img/product_pics/units/M5GO_Unit_color_sensor.png" height="300" width="300">
 </figure>