docs(vue): add file path

Author: thetaPC

docs/vue/your-first-app/3-saving-photos.md

@@ -15,7 +15,7 @@ We’re now able to take multiple photos and display them in a photo gallery on
 
 ## Filesystem API
 
-Fortunately, saving them to the filesystem only takes a few steps. Begin by creating a new class method, `savePicture()`, in the `usePhotoGallery()` method.
+Fortunately, saving them to the filesystem only takes a few steps. Begin by creating a new class method, `savePicture()`, in the `usePhotoGallery()` method in `usePhotoGallery.ts`.
 
 ```ts
 import { ref, onMounted, watch } from 'vue';

versioned_docs/version-v7/vue/your-first-app/3-saving-photos.md

@@ -15,7 +15,7 @@ We’re now able to take multiple photos and display them in a photo gallery on
 
 ## Filesystem API
 
-Fortunately, saving them to the filesystem only takes a few steps. Begin by creating a new class method, `savePicture()`, in the `usePhotoGallery()` method.
+Fortunately, saving them to the filesystem only takes a few steps. Begin by creating a new class method, `savePicture()`, in the `usePhotoGallery()` method in `usePhotoGallery.ts`.
 
 ```ts
 import { ref, onMounted, watch } from 'vue';