AN00246: Fix xdoc build

examples/AN00246_xua_example/doc/rst/AN00246.rst

@@ -1,4 +1,5 @@
 .. include:: ../../README.rst
+.. |I2C| replace:: I\ :sup:`2`\ C
 
 |newpage|
 
@@ -136,6 +137,17 @@ the audio I/O (i.e. I2S signalling).
 Configuration 
 .............
 
+``lib_xua`` has many parameters than can be configured at build time, some examples include:
+
+    - Sample-rates
+    - Channel counts
+    - Audio Class version
+    - Product/Vendor ID's
+    - Various product strings
+    - Master clock frequency
+
+These parameters are set via defines in an optional ``xua_conf.h`` header file.
+
 |appendix|
 |newpage|