Fix typo in comment.

src/darwin/Framework/CHIP/MTRDeviceController.h

@@ -137,7 +137,7 @@ typedef void (^MTRDeviceConnectionCallback)(MTRBaseDevice * _Nullable device, NS
 /**
  * Return the attestation challenge for the secure session of the device being commissioned.
  *
- * Attempts to retreive the generated attestation challenge from a commissionee with the given Device ID.
+ * Attempts to retrieve the generated attestation challenge from a commissionee with the given Device ID.
  * Returns nil if given Device ID does not match an active commissionee, or if a Secure Session is not availale.
  */
 - (nullable NSData *)generateAttestationChallengeForDeviceId:(uint64_t)deviceId;