docs/boards/esp32s3-xiao: Fix documentation typo

Fixed references to incorrect board ID 'xiao-esp32s3' instead of
'esp32s3-xiao'.

Signed-off-by: Matteo Golin <matteo.golin@gmail.com>

Documentation/platforms/xtensa/esp32s3/boards/esp32s3-xiao/index.rst

@@ -82,7 +82,7 @@ Installation
   $ git clone https://github.com/apache/nuttx-apps.git apps
   $ cd nuttx
   $ make distclean
-  $ ./tools/configure.sh xiao-esp32s3:usbnsh
+  $ ./tools/configure.sh esp32s3-xiao:usbnsh
   $ make V=1
 
 2. Connect the Seeed Studio XIAO ESP32S3, and enter "Bootloader" mode,
@@ -99,6 +99,14 @@ Example command:
 Configurations
 ==============
 
+Configurations can be selected using
+
+.. code:: console
+
+   $ ./tools/configure.sh esp32s3-xiao:<config>
+
+where ``<config>`` is the name of one of the configurations listed below.
+
 usbnsh
 ------
 Basic NuttShell configuration using CDC/ACM serial (console enabled in USB Port,