Import upstream CPython branch '3.14'

Summary:
Python `3.14.0rc2+` (`3.14`) was **published** on 2025-08-18 11:07:47+00:00.

# Commit Info

Base: (`3.14.0rc2+`) - `bb4e747654b73b1c3e9b23de1c294268ce9e0fe6` (commit date: 2025-08-16 17:24:17+00:00)
Imported: (`3.14.0rc2+`) - `3.14` (commit date: 2025-08-18 11:07:47+00:00)

Reviewed By: itamaro

Differential Revision: D80450552

fbshipit-source-id: 48297aa479e7db55bfb349251b2adbaf2d8a585c

Author: generatedunixname1734921407115435

Doc/library/string.templatelib.rst

@@ -34,7 +34,7 @@ To write a t-string, use a ``'t'`` prefix instead of an ``'f'``, like so:
    >>> pi = 3.14
    >>> t't-strings are new in Python {pi!s}!'
    Template(
-      strings=('t-strings are new in Python ', '.'),
+      strings=('t-strings are new in Python ', '!'),
       interpolations=(Interpolation(3.14, 'pi', 's', ''),)
    )