doc: zbus: isolated pool by channel

Add the information about the possibility of isolating the pool per
channel.

Signed-off-by: Rodrigo Peixoto <rodrigopex@gmail.com>

Author: rodrigopex

doc/services/zbus/index.rst

@@ -398,10 +398,13 @@ rate by following design tips:
 
 .. warning::
    ZBus uses :zephyr_file:`include/zephyr/net/buf.h` (network buffers) to exchange data with message
-   subscribers. So, chose carefully the configurations
+   subscribers. Thus, choose carefully the configurations
    :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_NET_BUF_POOL_SIZE` and
    :kconfig:option:`CONFIG_HEAP_MEM_POOL_SIZE`. They are crucial to a proper VDED execution
-   (delivery guarantee) considering message subscribers.
+   (delivery guarantee) considering message subscribers. If you want to keep an isolated pool for a
+   specific set of channels, you can use
+   :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_NET_BUF_POOL_ISOLATION` with a dedicated pool. Look
+   at the :zephyr:code-sample:`zbus-msg-subscriber` to see the isolation in action.
 
 .. warning::
    Subscribers will receive only the reference of the changing channel. A data loss may be perceived
@@ -410,7 +413,6 @@ rate by following design tips:
    only the last data is there.
 
 
-
 .. _zbus delivery sequence:
 
 Message delivery sequence
@@ -898,6 +900,8 @@ Related configuration options:
   buffers;
 * :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_NET_BUF_POOL_SIZE` the available number of message
   buffers to be used simultaneously;
+* :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_NET_BUF_POOL_ISOLATION` enables the developer to isolate
+  a pool for the message subscriber for a set of channels;
 * :kconfig:option:`CONFIG_ZBUS_MSG_SUBSCRIBER_NET_BUF_STATIC_DATA_SIZE` the biggest message of zbus
   channels to be transported into a message buffer;
 * :kconfig:option:`CONFIG_ZBUS_RUNTIME_OBSERVERS` enables the runtime observer registration.