fix: correct plugin link (#76)

Author: Ombuweb

packages/mlkit-face-detection/README.md

@@ -1,6 +1,6 @@
 # @nativescript/mlkit-face-detection
 
-A plugin that is used with [@nativescript/mlkit-core](../mlkit-core/) to enable face detection and provide the [FaceResult](#faceresult) type for the data of the face detection event.
+A plugin that is used with [@nativescript/mlkit-core](../plugins/mlkit-core/) to enable face detection and provide the [FaceResult](#faceresult) type for the data of the face detection event.
 
 ## Contents
 * [Installation](#installation)