Update Doc/library/datetime.rst

typo fix

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>

Author: jyalim

Doc/library/datetime.rst

@@ -2677,7 +2677,7 @@ differences between platforms in handling of unsupported format specifiers.
    ``%:z`` was added for :meth:`~.datetime.strftime`.
 
 .. versionadded:: 3.15
-   ``%D``, ``%F``, ``%t``, and ``:%z`` were added for
+   ``%D``, ``%F``, ``%t``, and ``%:z`` were added for
    :meth:`~.datetime.strptime`.
 
 Technical Detail