Updated return value of PEM_write_TYPE() and PEM_write_bio_TYPE() in …

…man-pages.

Fixes #20218

CLA: trivial

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #20673)

(cherry picked from commit dfb8e18)

doc/man3/PEM_read_CMS.pod

@@ -122,8 +122,7 @@ B<PEM_read_I<TYPE>>() and B<PEM_read_bio_I<TYPE>>() return a pointer to an
 allocated object, which should be released by calling B<I<TYPE>_free>(), or
 NULL on error.
 
-B<PEM_write_I<TYPE>>() and B<PEM_write_bio_I<TYPE>>() return the number of bytes
-written or zero on error.
+B<PEM_write_I<TYPE>>() and B<PEM_write_bio_I<TYPE>>() return 1 for success or 0 for failure.
 
 =head1 SEE ALSO