update GRBL pic

docs/en/module/goplus2.md

@@ -124,11 +124,11 @@ Communication protocol: IIC(0x38)
 
 To get example code, please [click here to download](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Module/GoPLUS2)
 
-<el-divider content-position="right">Last updated: 2020-12-28</el-divider>
+<el-divider content-position="right">Last updated: 2021-1-22</el-divider>
 
 <script>
 
-   var purchase_link = '';
+   var purchase_link = 'https://m5stack.com/collections/m5-module/products/goplus2-dc-motor-and-servo-driver-module-stm32f0';
 
    anchor_search(purchase_link);
    scrollFunc();

docs/en/module/nb-iot.md

@@ -70,7 +70,7 @@ Power Operation:
 
 ## Include
 
-- 1x NB-IoT module (Only China regional distribution SIM Card)
+- 1x NB-IoT module
 
 ## Applications
 

docs/en/module/servo2.md

@@ -98,7 +98,7 @@ To get the complete code, please click [here](https://github.com/m5stack/M5-Prod
 
 <script>
 
-   var purchase_link = '';
+   var purchase_link = 'https://m5stack.com/collections/m5stack-new-arrival/products/servo2-module-16-channels-13-2-pca9685';
 
    anchor_search(purchase_link);
    scrollFunc();

docs/zh_CN/module/goplus2.md

@@ -127,9 +127,11 @@
 
 点击[此处获取](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Module/GoPLUS2)示例程序
 
+<el-divider content-position="right">Last updated: 2021-1-22</el-divider>
+
 <script>
 
-   var purchase_link = '';
+   var purchase_link = 'https://m5stack.com/collections/m5-module/products/goplus2-dc-motor-and-servo-driver-module-stm32f0';
 
    anchor_search(purchase_link);
    scrollFunc();

docs/zh_CN/module/nb-iot.md

@@ -55,7 +55,6 @@
 
 ## 包含
 
--  1x Nano IoT SIM卡
 -  1x NB-IoT 模块
 
 ## 应用

docs/zh_CN/module/servo2.md

@@ -97,7 +97,7 @@
 
 <script>
 
-   var purchase_link = '';
+   var purchase_link = 'https://m5stack.com/collections/m5stack-new-arrival/products/servo2-module-16-channels-13-2-pca9685';
 
    anchor_search(purchase_link);
    scrollFunc();