Feature: more user review

This MR implements the doc review from CER.

docs/index.md

@@ -16,8 +16,14 @@ This is because VA interfaces make use of prototyping methods, which usually hav
 
 ::: vapython.va.VA
 
-::: vapython._helper.possible_aura_modes
+::: vapython._helper.possible_auralization_modes
     handler: python
     options:
         show_if_no_docstring: true
-        line_length: 60
\ No newline at end of file
+        line_length: 60
+
+::: vapython._helper.default_auralization_mode
+    handler: python
+    options:
+        show_if_no_docstring: true
+        line_length: 60