doc: release notes: fix spelling and formatting

Major enhancements with this release include:

* Thread-level memory protection on x86, ARC and ARM, userspace and memory

* Thread-level memory protection on x86, ARC and Arm, userspace and memory

  domains

* Symmetric Multi Processing (SMP) support on the Xtensa architecture.

* Initial Armv8-M architecture support.

* Native build target on POSIX platforms.

* POSIX PSE52 partial support.

* Thread support via integration with OpenThread.

* Over the Air Firmware Updates over BLE using MCUmgr.

* Firmware over-the-air (FOTA) updates over BLE using MCUmgr.

* Lightweight flash storage layer for constrained devices.

* Additional SoC, platform and driver support for many of the already supported

  platforms.

******

* Initial Symmetric Multi Processing (SMP) support added:

  * SMP-aware scheduler

  * SMP timer and idling support

  * Available on the Xtensa architecture

* POSIX PSE52 support:

  * Timer, clock, scheduler and pthread APIs

Architectures

*************

* User space and system call related changes:

  * Added ARC user space implementation

  * Added ARM user space implementation

  * Added Arm user space implementation

  * Fixed a few MPU related issues with stack guards

* Armv8-M iniital architecture support, including the following cores:

* Armv8-M initial architecture support, including the following cores:

  * Arm Cortex-M23

  * Arm Cortex-M33

* New "posix" architecture for native GNU/Linux and macOS build targets:

  * Targets native executables that can be run on the operating system

* New POSIX architecture for native GNU/Linux and macOS build targets:

  * Targets native executables that can be run on the host operating system

Boards

******

* New native_posix board for the posix architecture:

* New native_posix board for the POSIX architecture:

  * Includes a template for hardware models

  * Adds support for console and logging

  * Interrupts and timers are simulated in several different configurations

* Added support for the following ARM boards:

* Added support for the following Arm boards:

  * adafruit_trinket_m0

  * arduino_zero

  * nucleo_f429zi

  * stm32f072_eval

  * stm32f072b_disco

* Removed Panther board support which included boards/x86/panther and

* Removed Panther board support, which included boards/x86/panther and

  boards/arc/panther_ss

* Refactored dts.fixup so common SoC related fixes are in arch/<*>/soc

  and board dts.fixup only used for board specific items.

* Refactored dts.fixup so common SoC-related fixes are in arch/<*>/soc

  and board dts.fixup is only used for board-specific items.

Drivers and Sensors

*******************

* New LED PWM driver for ESP32 SoC

* Fixed ESP32 I2C driver

* Added i2c master, qspi flash, and gpio drivers for nios-II

* Added pinmux, gpio, serial drivers for lpc54114

* Added pinmux, gpio, serial, spi, and watchdog drivers for sam0

* Added apa102 and ws2821b led_strip drivers

* Added I2C master, QSPI flash, and GPIO drivers for nios-II

* Added PinMux, GPIO, serial drivers for LPC54114

* Added PinMux, GPIO, serial, SPI, and watchdog drivers for sam0

* Added APA102 and WS2821B led_strip drivers

* Added native entropy driver

* Moved some sensors to dts

* Added amg88xx, ccs811, and vl53l0x sensor drivers

* Added AMG88xx, CCS811, and VL53L0x sensor drivers

* Redefined SENSOR_CHAN_HUMIDITY in percent

Networking

**********

* Generic OpenThread support added

* OpenThread support to nrf5 IEEE 802.15.4 driver added

* OpenThread support to nRF5 IEEE 802.15.4 driver added

* NXP MCUX ethernet driver IPv6 multicast join/leave enhancements

* Ethernet stm32 fixes

* Ethernet STM32 fixes

* IEEE 802.15.4 Sub-GHz TI CC1200 chip support added

* IEEE 802.15.4 test driver (upipe) hw filtering support added

* IEEE 802.15.4 radio API enhancements

Build and Infrastructure

************************

* Native development enviroment on Microsoft Windows:

* Native development environment on Microsoft Windows:

  * Uses CMake and Kconfiglib to avoid requiring an emulation layer

  * Package management support with Chocolatey for simple setup

  * Build time now comparable to Linux and macOS using Ninja

Libraries / Subsystems

***********************

* New management subystem based on the cross-RTOS MCUmgr:

* New management subsystem based on the cross-RTOS MCUmgr:

  * Secure Firmware Updates over BLE and serial

  * Support for file system access and statistics

  * mcumgr cross-platform command-line tool

* FCB (File Circular Buffer) lightweight storage layer:

  * Wear-levelling support for NOR flashes

  * Wear-leveling support for NOR flashes

  * Suitable for memory constrained devices

HALs

****

* Updated ARM CMSIS from version 4 to 5.2.0

* Updated Arm CMSIS from version 4.5.0 to 5.2.0

* Updated stm32cube stm32l4xx from version 1.9.0 to 1.10.0

* Updated stm32cube stm32f4xx from version 1.16.0 to 1.18.0

* Added Atmel SAMD21 HAL

* Added mcux 2.2.1 for lpc54114

* Added HAL for vl53l0x sensor from STM

* Imported and moved to nrfx 0.8.0 on Nordic SoCs

* Added mcux 2.2.1 for LPC54114

* Added HAL for VL53L0x sensor from STM

* Imported and moved to nRFx 0.8.0 on Nordic SoCs

* Added QSPI Controller HAL driver

Documentation

* Improved docs for Native (POSIX) support

* Docs for new samples and supported board

* General documentation clarifications and improvements

* Identify daily-built master-branch docs as "Latest" version

* Addressed Sphinx-generated intra-page link issues

* Updated doc generation tools (Doxygen, Sphinx, Breathe, Docutils)