doc: fix list display in man page

"=over 1" is too small.  Use "=over 2" so that list items are
displayed correctly in the generated man-page.

You can check the man-page using the following command:

  cd doc && pod2man man3/OSSL_PARAM_int.pod | man /dev/stdin

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from #22974)

(cherry picked from commit 7f4bf18)

doc/man3/OSSL_PARAM_int.pod

@@ -112,7 +112,7 @@ OSSL_PARAM_UNMODIFIED, OSSL_PARAM_modified, OSSL_PARAM_set_all_unmodified
 A collection of utility functions that simplify and add type safety to the
 L<OSSL_PARAM(3)> arrays.  The following B<I<TYPE>> names are supported:
 
-=over 1
+=over 2
 
 =item *