doc: board: toradex: minor documentation update

- Update SPDX-License-Identifier from obsolete GPL-2.0+ to
  GPL-2.0-or-later.
- Add links to product websites of SoM and carrier board where missing.
- Add information about update U-Boot wrapper where missing.
- Add sectionauthor where missing.
- Update information about imx-seco from version 3.7.4 to 3.8.1.
- Various minor grammatic and spelling fixes.
- Improve whitespace by adding or removing new lines.
- Change from code-block for output to just Output::.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/doc/board/toradex/colibri-imx8x.rst b/doc/board/toradex/colibri-imx8x.rst
index 545568c..9e61d98 100644
--- a/doc/board/toradex/colibri-imx8x.rst
+++ b/doc/board/toradex/colibri-imx8x.rst
@@ -1,7 +1,11 @@
-.. SPDX-License-Identifier: GPL-2.0+
+.. SPDX-License-Identifier: GPL-2.0-or-later
+.. sectionauthor:: Marcel Ziswiler <marcel.ziswiler@toradex.com>
 
-Colibri iMX8QXP V1.0D Module
-============================
+Colibri iMX8X Module
+====================
+
+- SoM: https://www.toradex.com/computer-on-modules/colibri-arm-family/nxp-imx-8x
+- Carrier board: https://www.toradex.com/products/carrier-board/colibri-evaluation-board
 
 Quick Start
 -----------
@@ -23,18 +27,19 @@
 
 Get scfw_tcm.bin and ahab-container.img
 ---------------------------------------
+
 .. code-block:: bash
 
     $ wget https://github.com/toradex/i.MX-System-Controller-Firmware/raw/master/src/scfw_export_mx8qx_b0/build_mx8qx_b0/mx8qx-colibri-scfw-tcm.bin
-    $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-seco-3.7.4.bin
-    $ sh imx-seco-3.7.4.bin --auto-accept
+    $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-seco-3.8.1.bin
+    $ sh imx-seco-3.8.1.bin --auto-accept
 
 Copy the following firmware to the U-Boot folder:
 
 .. code-block:: bash
 
     $ cp imx-atf/build/imx8qx/release/bl31.bin .
-    $ cp imx-seco-3.7.4/firmware/seco/mx8qxc0-ahab-container.img mx8qx-ahab-container.img
+    $ cp imx-seco-3.8.1/firmware/seco/mx8qxc0-ahab-container.img mx8qx-ahab-container.img
 
 Build U-Boot
 ------------
@@ -51,8 +56,8 @@
 
 https://community.nxp.com/external-link.jspa?url=https%3A%2F%2Fgithub.com%2FNXPmicro%2Fmfgtools%2Freleases
 
-Put the module into USB recovery aka serial downloader mode, connect USB device
-to your host and execute ``uuu``:
+Put the module into USB recovery aka serial downloader mode, connect the USB
+device to your host and execute ``uuu``:
 
 .. code-block:: bash
 
@@ -61,7 +66,8 @@
 Flash the U-Boot Binary into the eMMC
 -------------------------------------
 
-Burn the ``u-boot-dtb.imx`` binary to the primary eMMC hardware boot area partition:
+Burn the ``u-boot-dtb.imx`` binary to the primary eMMC hardware boot area
+partition and boot:
 
 .. code-block:: bash
 
@@ -69,3 +75,10 @@
     setexpr blkcnt ${filesize} + 0x1ff && setexpr blkcnt ${blkcnt} / 0x200
     mmc dev 0 1
     mmc write ${loadaddr} 0x0 ${blkcnt}
+
+As a convenience, instead of the last three commands, one may also use the
+update U-Boot wrapper:
+
+.. code-block:: bash
+
+    > run update_uboot