[docs] Wrong docs for authorizationSecret deprecations

[kishormainali]

init method is marked as deprecated instead of authorizationSecret property

current:

@Deprecated('[authorizationSecret] will be removed in next releases')
init(String applicationId, String authorizationKey, String authorizationSecret,
    {Future<CubeSession> Function()? onSessionRestore}) {}

this should be

init(
  String applicationId,
  String authorizationKey,
  @Deprecated('[authorizationSecret] will be removed in next releases')
  String authorizationSecret, {
  Future<CubeSession> Function()? onSessionRestore,
}) {}

its showing lint warning for init method

 'init' is deprecated and shouldn't be used. [authorizationSecret] will be removed in next releases. Try replacing the use of the deprecated member with the replacement. •
          deprecated_member_use