Clarify wording in annotate function documentation

Author: dr-carlos

Doc/glossary.rst

@@ -39,10 +39,11 @@ Glossary
       ABCs with the :mod:`abc` module.
 
    annotate function
-      A callable, usually a function, that can be called to retrieve the
-      :term:`annotations <annotation>` of an object. An annotate function is accessible
-      as the :attr:`~object.__annotate__` attribute of functions, classes, and modules.
-      Annotate functions are a subset of :term:`evaluate functions <evaluate function>`.
+      A callable that can be called to retrieve the :term:`annotations <annotation>` of
+      an object. Annotate functions are usually :term:`functions <function>`,
+      automatically generated as the :attr:`~object.__annotate__` attribute of functions,
+      classes, and modules. Annotate functions are a subset of
+      :term:`evaluate functions <evaluate function>`.
 
    annotation
       A label associated with a variable, a class