Merge "libbinder_rs: disambiguate startThreadPool "recommendation"" into main

    /// `num_threads` additional threads as specified by

    /// [`set_thread_pool_max_thread_count`](Self::set_thread_pool_max_thread_count).

    ///

    /// This should be done before creating any Binder client or server. If

    /// neither this nor [`join_thread_pool`](Self::join_thread_pool) are

    /// If this is called, it must be done before creating any Binder client or server.

    ///

    /// If neither this nor [`join_thread_pool`](Self::join_thread_pool) are

    /// called, then some things (such as callbacks and

    /// [`IBinder::link_to_death`](crate::IBinder::link_to_death)) will silently

    /// not work: the callbacks will be queued but never called as there is no