fixing typo in comment (#682)

Co-authored-by: Hee Tatt Ooi <hee.tatt.ooi@sap.com>
Co-authored-by: Jakob Möller <jakob.moeller@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/worker/DiagnosisTestResultRetrievalPeriodicWorker.kt

@@ -15,7 +15,7 @@ import de.rki.coronawarnapp.worker.BackgroundWorkScheduler.stop
 import timber.log.Timber
 
 /**
- * Diagnosis Test Result Periodic retrieavl
+ * Diagnosis Test Result Periodic retrieval
  *
  * @see BackgroundWorkScheduler
  */