[3.14] gh-135244: improve wording of uuid8 docs about CSPRNG (GH-135433) (#135467)

gh-135244: improve wording of `uuid8` docs about CSPRNG (GH-135433)
(cherry picked from commit 394d798)

Co-authored-by: LamentXU <108666168+LamentXU123@users.noreply.github.com>

Author: miss-islington

Doc/library/uuid.rst

@@ -257,7 +257,7 @@ The :mod:`uuid` module defines the following functions:
    non-specified arguments are substituted for a pseudo-random integer of
    appropriate size.
 
-   By default, *a*, *b* and *c* are generated by a non-cryptographically
+   By default, *a*, *b* and *c* are not generated by a cryptographically
    secure pseudo-random number generator (CSPRNG). Use :func:`uuid4` when
    a UUID needs to be used in a security-sensitive context.