The Google Photos custom client_id documentation was incomplete - it
only mentioned changing the scopes but did not mention that you need
to enable the "Photos Library API" instead of the "Google Drive API"
in step 3 of the referenced Google Drive instructions.
This fixes the documentation to clearly state both differences from
the Google Drive setup:
- Enable "Photos Library API" instead of "Google Drive API"
- Use the Google Photos specific scopes
Co-authored-by: hyusap <paulayush@gmail.com>
