[Document Scanner] Italian translation of "Auto capture" is misleading ("Scatto multiplo" means "Multiple shot")

## Bug

The Italian translation of the **"Auto capture"** toggle in ML Kit Document Scanner's camera UI is `"Scatto multiplo"`, which translates back to English as **"Multiple shot"** / **"Multiple snap"**. Italian users naturally read this as a control for capturing multiple pages, not as a control for the auto-shutter behavior on document detection.

This is especially misleading when the integrator has set `setPageLimit(1)` — the UI implies a multi-page action that, by configuration, cannot happen.

## Library / dependency

```
implementation 'com.google.android.gms:play-services-mlkit-document-scanner:16.0.0'
```

## Reproduce

1. Add the dependency above.
2. Configure with at least:
val options = GmsDocumentScannerOptions.Builder()
.setGalleryImportAllowed(false)
.setPageLimit(1)
.setResultFormats(GmsDocumentScannerOptions.RESULT_FORMAT_JPEG)
.setScannerMode(GmsDocumentScannerOptions.SCANNER_MODE_BASE)
.build()
3. Set the device language to Italian (Impostazioni → Sistema → Lingue e immissione → Italiano).
4. Launch the scanner with GmsDocumentScanning.getClient(options).getStartScanIntent(activity).
5. Observe the toggle in the top-right of the camera viewfinder: in English it reads "Auto capture" and toggles between Auto / Off (controls whether the camera auto-fires when a document is detected); in Italian it reads "Scatto multiplo".

## Expected behaviour

The Italian string should clearly communicate "automatic capture" — i.e. the camera will auto-fire when it recognises a document — without implying multi-page behaviour.

## Suggested translation

- Cattura automatica — direct equivalent, unambiguous.
- Alternative: Scatto automatico — slightly more colloquial for the camera context; matches the "Scatto" naming convention but with the correct semantic (automatico = automatic, not multiplo = multiple).

Both convey the same meaning as the English string and are unambiguous to Italian native speakers.

## Environment

- ML Kit Document Scanner: 16.0.0 (latest at time of report)
- Tested on:
- Pixel 8 emulator (API 35, 16 KB page size) — sdk_gphone16k_arm64
- Pixel 7 emulator (API 35, 4 KB page size) — sdk_gphone64_arm64
- Pixel 6a physical device (Android 16, API 36, 4 KB pages) — bluejay
- Device language: Italian (it-IT)
- Behaviour identical across all three.