bpo-37075: Fix string concatenation in assert_has_awaits error message (GH-13616)



* Fix the implicit string concatenation in `assert_has_awaits` error message.
* Use "await" instead of "call" in `assert_awaited_with` error message.



https://bugs.python.org/issue37075
diff --git a/Doc/library/unittest.mock.rst b/Doc/library/unittest.mock.rst
index da6cdfe..46e8ef3 100644
--- a/Doc/library/unittest.mock.rst
+++ b/Doc/library/unittest.mock.rst
@@ -1954,7 +1954,7 @@
 * Container methods: ``__getitem__``, ``__setitem__``, ``__delitem__``,
   ``__contains__``, ``__len__``, ``__iter__``, ``__reversed__``
   and ``__missing__``
-* Context manager: ``__enter__``, ``__exit__``, ``__aenter`` and ``__aexit__``
+* Context manager: ``__enter__``, ``__exit__``, ``__aenter__`` and ``__aexit__``
 * Unary numeric methods: ``__neg__``, ``__pos__`` and ``__invert__``
 * The numeric methods (including right hand and in-place variants):
   ``__add__``, ``__sub__``, ``__mul__``, ``__matmul__``, ``__div__``, ``__truediv__``,
@@ -2036,6 +2036,7 @@
 * ``__len__``: 0
 * ``__iter__``: iter([])
 * ``__exit__``: False
+* ``__aexit__``: False
 * ``__complex__``: 1j
 * ``__float__``: 1.0
 * ``__bool__``: True