message: Update descriptions on GetFile_ options
diff: @@ -389,11 +389,13 @@ function handleSignedEncryptedContents(caller: UserSession, path: string, stored
  export interface GetFileUrlOptions {
  /**
  * The Blockstack ID to lookup for multi-player storage.
  + * If not specified, the currently signed in username is used.
  */
  username?: string;
  /**
  * The app to lookup for multi-player storage - defaults to current origin.
  * @default `window.location.origin`
  + * Only if available in the executing environment, otherwise `undefined`.
  */
  app?: string;
  /**
  