[3.6] Fix typos in multiple `.rst` files (GH-1668) (#1702)

(cherry picked from commit 3378b2062c7fbb77a9b5e6d315d6b94160fac69a)
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 43d2690..d92be97 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -636,7 +636,7 @@
    without yielding another value, an :exc:`StopAsyncIteration` exception is
    raised by the awaitable.
    If the generator function does not catch the passed-in exception, or
-   raises a different exception, then when the awaitalbe is run that exception
+   raises a different exception, then when the awaitable is run that exception
    propagates to the caller of the awaitable.
 
 .. index:: exception: GeneratorExit