Updated link for Blob detection tutorial

The provided link for blob detection tutorial seemed to be faulty, I found a tutorial that this article seemed to be mentioning, and updated the link.

Author: bashynx

content/hardware/04.pro/shields/portenta-vision-shield/tutorials/vs-openmv-fd/content.md

@@ -38,7 +38,7 @@ The built-in Haar Cascade model for faces was trained with hundreds of images co
 
 ### Creating the Face Detection Script
 
-For this tutorial you will be using the OpenMV IDE along with the OpenMV firmware on your Portenta H7 to build the face detection script. If this is your first time using the Vision Carrier and OpenMV we recommend you to take a look at the "Configuring the Development Environment" section inside the [Blob Detection tutorial](https://www.arduino.cc/pro/tutorials/portenta-h7/por-openmv-bt) to configure the development environment. 
+For this tutorial you will be using the OpenMV IDE along with the OpenMV firmware on your Portenta H7 to build the face detection script. If this is your first time using the Vision Carrier and OpenMV we recommend you to take a look at the "Configuring the Development Environment" section inside the [Blob Detection tutorial](https://docs.arduino.cc/tutorials/portenta-vision-shield/vs-openmv-bt) to configure the development environment. 
 
 ### 1. The Basic Setup