Add missing end of sentence in docs (GH-27280)

diff --git a/Doc/library/concurrent.futures.rst b/Doc/library/concurrent.futures.rst
index d57f8ce23d12c49c43e27881cd635228d5a3be0f..897efc2f544426d450b9defd1bd735c7a0836260 100644 (file)
--- a/Doc/library/concurrent.futures.rst
+++ b/Doc/library/concurrent.futures.rst
@@ -350,7 +350,7 @@ The :class:`Future` class encapsulates the asynchronous execution of a callable.
        If the future is cancelled before completing then :exc:`.CancelledError`
        will be raised.
 
-       If the call raised, this method will raise the same exception.
+       If the call raised an exception, this method will raise the same exception.
 
     .. method:: exception(timeout=None)