Issue #26304: Change "allows to <verb>" to "allows <verb>ing" or similar

The original form is incorrect grammar and feels awkward, even though the
meaning is clear.
diff --git a/Lib/asyncio/futures.py b/Lib/asyncio/futures.py
index 4dcb654..281fea3 100644
--- a/Lib/asyncio/futures.py
+++ b/Lib/asyncio/futures.py
@@ -142,7 +142,7 @@
     def __init__(self, *, loop=None):
         """Initialize the future.
 
-        The optional event_loop argument allows to explicitly set the event
+        The optional event_loop argument allows explicitly setting the event
         loop object used by the future. If it's not provided, the future uses
         the default event loop.
         """