Issue #25523: Merge "a" to "an" fixes from 3.4 into 3.5

1 files changed, 2 insertions, 2 deletions

diff --git a/Doc/library/concurrent.futures.rst b/Doc/library/concurrent.futures.rst
index 9ac6171..8bb70a5 100644
--- a/Doc/library/concurrent.futures.rst
+++ b/Doc/library/concurrent.futures.rst
@@ -90,7 +90,7 @@ Executor Objects
 ThreadPoolExecutor
 ------------------
 
-:class:`ThreadPoolExecutor` is a :class:`Executor` subclass that uses a pool of
+:class:`ThreadPoolExecutor` is an :class:`Executor` subclass that uses a pool of
 threads to execute calls asynchronously.
 
 Deadlocks can occur when the callable associated with a :class:`Future` waits on
@@ -304,7 +304,7 @@ The :class:`Future` class encapsulates the asynchronous execution of a callable.
 
        Added callables are called in the order that they were added and are
        always called in a thread belonging to the process that added them.  If
-       the callable raises a :exc:`Exception` subclass, it will be logged and
+       the callable raises an :exc:`Exception` subclass, it will be logged and
        ignored.  If the callable raises a :exc:`BaseException` subclass, the
        behavior is undefined.