doc: openthread: align documentation to recent changes

Align documentation after dropping support for Thread minimal
CLI sample configuration.

Signed-off-by: Lukasz Maciejonczyk <lukasz.maciejonczyk@nordicsemi.no>

doc/nrf/app_memory.rst

@@ -115,8 +115,6 @@ Besides applying `General recommendations`_, you can also complete the following
   * :kconfig:option:`CONFIG_MAIN_STACK_SIZE`
   * :kconfig:option:`CONFIG_ISR_STACK_SIZE`
 
-For reference, you can find minimal footprint configurations for the single protocol and multiprotocol variants of the :ref:`ot_cli_sample` sample in :file:`nrf/samples/openthread/cli/overlay-minimal_*protocol.conf`.
-
 .. _app_memory_zigbee:
 
 Zigbee

doc/nrf/releases/release-notes-changelog.rst

@@ -59,6 +59,7 @@ Thread
 
 * Added support for the Link Metrics and CSL Thread v1.2 features for the nRF53 Series devices.
 * Removed support for the :ref:`thread_architectures_designs_cp_ncp` architecture and the related tools.
+* Memory requirements page shows requirements based on the configuration used for certification instead of minimal configuration which has been removed.
 
 Zigbee
 ------
@@ -253,15 +254,16 @@ nRF9160 samples
 
     * Enabled the :ref:`lib_at_host` library to make it easier to update certificates.
 
-OpenThread samples
-------------------
+Thread samples
+--------------
 
 * Updated:
 
   * Thread 1.2 version made the default configuration option.
   * Thread Beacon payload has been removed after changes in latest Thread Specification.
   * The relevant sample documentation pages with information about support for :ref:`Trusted Firmware-M <ug_tfm>`.
   * All sample documentation with a Configuration section, and organized relevant information under that section.
+  * Mnimal configuration for CLI sample has been removed.
 
 Matter samples
 --------------