Remove unused crypto type and missing doc (#4696)

* chore(crypto): remove unused types

* doc(crypto): add missing link

Author: florianduros

src/@types/crypto.ts

@@ -16,11 +16,6 @@ limitations under the License.
 
 import type { ISignatures } from "./signed.ts";
 
-export type OlmGroupSessionExtraData = {
-    untrusted?: boolean;
-    sharedHistory?: boolean;
-};
-
 // Backwards compatible re-export
 export type { EventDecryptionResult as IEventDecryptionResult } from "../common-crypto/CryptoBackend.ts";
 

src/rust-crypto/backup.ts

@@ -118,7 +118,7 @@ export class RustBackupManager extends TypedEventEmitter<RustBackupCryptoEvents,
     /**
      * Determine if a key backup can be trusted.
      *
-     * @param info - key backup info.
+     * @param info - key backup info dict from {@link CryptoApi.getKeyBackupInfo}.
      */
     public async isKeyBackupTrusted(info: KeyBackupInfo): Promise<BackupTrustInfo> {
         const signatureVerification: SignatureVerification = await this.olmMachine.verifyBackup(info);