documentation/esp32s3: add qemu_toywasm defconfig

Add description of qemu_toywasm defconfig to ESP32S3 documentation.

Signed-off-by: Filipe Cavalcanti <filipe.cavalcanti@espressif.com>

Author: fdcavalcanti

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

@@ -157,10 +157,10 @@ the following output is expected::
     nsh> cap
     cap_main: Hardware initialized. Opening the capture device: /dev/capture0
     cap_main: Number of samples: 0
-    pwm duty cycle: 50 % 
-    pwm frequence: 50 Hz 
-    pwm duty cycle: 50 % 
-    pwm frequence: 50 Hz 
+    pwm duty cycle: 50 %
+    pwm frequence: 50 Hz
+    pwm duty cycle: 50 %
+    pwm frequence: 50 Hz
 
 coremark
 --------
@@ -488,6 +488,12 @@ A configuration tailored for the `Espressif fork of QEMU`_.
 
 .. _Espressif fork of QEMU: https://github.com/espressif/qemu
 
+qemu_toywasm
+------------
+
+Based on ``qemu_debug`` defconfig, with the addition of WebAssembly support.
+See :ref:`toywasm` for more further details.
+
 random
 ------
 
@@ -668,6 +674,8 @@ To test it, just run the following::
 
 Where x in the timer instance.
 
+.. _toywasm:
+
 toywasm
 -------