gh-99953: Purge mention of numeric param style from sqlite3 docs (GH-100630)

The PEP-249 numeric style has never been supported by sqlite3.
(cherry picked from commit b7a68ab)

Co-authored-by: Erlend E. Aasland <[email protected]>

Author: miss-islington

Doc/library/sqlite3.rst

@@ -476,11 +476,7 @@ Module constants
 
    .. note::
 
-      The :mod:`!sqlite3` module supports ``qmark``, ``numeric``,
-      and ``named`` DB-API parameter styles,
-      because that is what the underlying SQLite library supports.
-      However, the DB-API does not allow multiple values for
-      the ``paramstyle`` attribute.
+      The ``named`` DB-API parameter style is also supported.
 
 .. data:: sqlite_version