boards: raspberrypi: adopt new zephyr:board directive and role

This updates the documentation of all the Rasperry Pi boards to use
the new `zephyr:board::` directive.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

boards/raspberrypi/rpi_4b/doc/index.rst

@@ -1,7 +1,4 @@
-.. rpi_4b:
-
-Raspberry Pi 4 Model B (Cortex-A72)
-###################################
+.. zephyr:board:: rpi_4b
 
 Overview
 ********

boards/raspberrypi/rpi_5/doc/index.rst

@@ -1,7 +1,4 @@
-.. _rpi_5:
-
-Raspberry Pi 5 (Cortex-A76)
-###########################
+.. zephyr:board:: rpi_5
 
 Overview
 ********

boards/raspberrypi/rpi_pico/doc/index.rst

@@ -1,7 +1,4 @@
-.. _rpi_pico:
-
-Raspberry Pi Pico
-#################
+.. zephyr:board:: rpi_pico
 
 Overview
 ********

doc/releases/release-notes-3.7.rst

@@ -409,7 +409,7 @@ Boards & SoC Support
 
   * Added support for :zephyr:board:`Ambiq Apollo3 Blue board <apollo3_evb>`: ``apollo3_evb``.
   * Added support for :zephyr:board:`Ambiq Apollo3 Blue Plus board <apollo3p_evb>`: ``apollo3p_evb``.
-  * Added support for :ref:`Raspberry Pi 5 board <rpi_5>`: ``rpi_5``.
+  * Added support for :zephyr:board:`Raspberry Pi 5 board <rpi_5>`: ``rpi_5``.
   * Added support for :zephyr:board:`Seeed Studio XIAO RP2040 board <xiao_rp2040>`: ``xiao_rp2040``.
   * Added support for :zephyr:board:`Mikroe RA4M1 Clicker board <mikroe_clicker_ra4m1>`: ``mikroe_clicker_ra4m1``.
   * Added support for :ref:`Arduino UNO R4 WiFi board <arduino_uno_r4>`: ``arduino_uno_r4_wifi``.

samples/sensor/bme280/README.rst

@@ -77,7 +77,7 @@ peripheral.
 BME280 via Raspberry Pi Pico
 ============================
 
-The default assignment of the built-in spi0 device on the :ref:`rpi_pico` is
+The default assignment of the built-in spi0 device on the :zephyr:board:`rpi_pico` is
 to GPIO16 through GPIO19.  With the sensor wired to those lines, build and
 flash with: