doc: release-notes-3.6: zbus related changes

* ZBus

  * Replace mutexes with semaphores to lock channels and implement the Highest Locker Protocol (HLP)

    priority boost for the zbus operations. This feature avoids priority inversions and preemptions,

    making the VDED delivery process faster and more consistent. (:github:`63183`)

  * Fixed documentation for :c:func:`zbus_chan_add` and :c:func:`zbus_chan_rm` adding the timeout

    argument. (:github:`65544`)

  * Fixed warning when mixing C and C++ files using zbus. (:github:`65222`)

  * :c:macro:`ZBUS_CHANNEL_DEFINE` macro is now compatible with C++. (:github:`65196`)

  * Fixed parameter order of net buf pool fixed definition. (:github:`65039`)

  * Complete refactoring of benchmark sample, adding message subscribers. (:github:`64524`)

  * Renamed ``CONFIG_ZBUS_MSG_SUBSCRIBER_NET_BUF_DYNAMIC`` and

    ``CONFIG_ZBUS_MSG_SUBSCRIBER_NET_BUF_STATIC``

    to :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_BUF_ALLOC_DYNAMIC` and

    :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_BUF_ALLOC_STATIC`

    ``CONFIG_ZBUS_MSG_SUBSCRIBER_NET_BUF_STATIC`` to

    :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_BUF_ALLOC_DYNAMIC` and

    :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_BUF_ALLOC_STATIC`. (:github:`65632`)

HALs

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