Issue #15825: fix typo in OrderedDict docs.

Patch by Mike Hoy.
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index e90b25e..57e0481 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -878,7 +878,7 @@
 to the end and the sort is not maintained.
 
 It is also straight-forward to create an ordered dictionary variant
-that the remembers the order the keys were *last* inserted.
+that remembers the order the keys were *last* inserted.
 If a new entry overwrites an existing entry, the
 original insertion position is changed and moved to the end::