docs: explicitly replicate the docstring

docs/implementations/python/api.rst

@@ -9,9 +9,22 @@ Python API
 
     .. manually documented as parse_annotation is undocumented
 
-    .. autofunction:: parse_annotation
+    .. function:: parse_annotation
 
         Parse a string into one or more :class:`IonAnnotationBase` instances.
 
-        See :meth:`AnnotationStringParser.__call__` for more details about the implementation
-        and actual arguments.
+        Parameters
+        ----------
+        annotation_string : str
+            The string to be parsed
+        wrap_errors : bool, optional
+            Whether or not to capture parsing errors as :class:`InvalidAnnotation` or not. Defaults to :const:`False`.
+
+        Returns
+        -------
+        list[:class:`IonAnnotationBase`] :
+            The annotations parsed
+
+        See Also
+        --------
+        :class:`mzpaf.AnnotationStringParser`