docs(react): use slice

Author: thetaPC

docs/react/your-first-app/7-live-reload.md

@@ -59,7 +59,7 @@ export function usePhotoGallery() {
     Preferences.set({ key: PHOTO_STORAGE, value: JSON.stringify(newPhotos) });
 
     // Delete photo file from filesystem
-    const filename = photo.filepath.substr(photo.filepath.lastIndexOf('/') + 1);
+    const filename = photo.filepath.slice(photo.filepath.lastIndexOf('/') + 1);
     await Filesystem.deleteFile({
       path: filename,
       directory: Directory.Data,

versioned_docs/version-v7/react/your-first-app/7-live-reload.md

@@ -59,7 +59,7 @@ export function usePhotoGallery() {
     Preferences.set({ key: PHOTO_STORAGE, value: JSON.stringify(newPhotos) });
 
     // Delete photo file from filesystem
-    const filename = photo.filepath.substr(photo.filepath.lastIndexOf('/') + 1);
+    const filename = photo.filepath.slice(photo.filepath.lastIndexOf('/') + 1);
     await Filesystem.deleteFile({
       path: filename,
       directory: Directory.Data,