Update doc on interpolation validation / conversion

docs/source/structured_config.rst

@@ -333,7 +333,7 @@ To work around it, use SI and II described below.
     >>> assert conf.c == 100
 
 
-Type validation (and implicit conversion when possible) is performed both on assignment and on values returned by interpolations, e.g:
+Interpolated values are validated, and converted when possible, to the annotated type when the interpolation is accessed, e.g:
 
 .. doctest::
 
@@ -350,9 +350,8 @@ Type validation (and implicit conversion when possible) is performed both on ass
     omegaconf.errors.ValidationError: Value 'string' could not be converted to Integer
         full_key: int_key
         object_type=Interpolation
-    >>> cfg.str_key = 1234  # convert int to str (assignment)
-    >>> assert cfg.str_key == "1234"
-    >>> assert cfg.int_key == 1234  # convert str to int (interpolation)
+    >>> cfg.str_key = "1234"  # string value
+    >>> assert cfg.int_key == 1234  # automatically convert str to int
 
 
 Frozen