[3.10] Fix outdated note about 'int' rounding or truncating (GH-102736)…

… (#102767)

Fix outdated note about 'int' rounding or truncating (GH-102736)
(cherry picked from commit 405739f)

Co-authored-by: Mark Dickinson <dickinsm@gmail.com>

Doc/library/stdtypes.rst

@@ -335,11 +335,10 @@ Notes:
       single: ceil() (in module math)
       single: trunc() (in module math)
       pair: numeric; conversions
-      pair: C; language
 
-   Conversion from floating point to integer may round or truncate
-   as in C; see functions :func:`math.floor` and :func:`math.ceil` for
-   well-defined conversions.
+   Conversion from :class:`float` to :class:`int` truncates, discarding the
+   fractional part. See functions :func:`math.floor` and :func:`math.ceil` for
+   alternative conversions.
 
 (4)
    float also accepts the strings "nan" and "inf" with an optional prefix "+"