Fix typos in comment and documentation

Doc/library/re.rst

@@ -762,7 +762,7 @@ form.
       now are errors.
 
    .. deprecated-removed:: 3.5 3.7
-      Unknown escapes in *repl* consist of ``'\'`` and ASCII letter now raise
+      Unknown escapes in *repl* consisting of ``'\'`` and an ASCII letter now raise
       a deprecation warning and will be forbidden in Python 3.7.
 
 

Objects/abstract.c

@@ -2325,7 +2325,7 @@ exit:
     return result;
 }
 
-/* Positional arguments are obj followed args. */
+/* Positional arguments are obj followed by args. */
 PyObject *
 _PyObject_Call_Prepend(PyObject *func,
                        PyObject *obj, PyObject *args, PyObject *kwargs)