Fix doc nits in X509_check_private_key.pod

remove the tailing dot
Signed-off-by: NPaul Yang <paulyang.inf@gmail.com>
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3614)

doc/man3/X509_check_private_key.pod

@@ -4,7 +4,7 @@
 
 X509_check_private_key, X509_REQ_check_private_key - check the consistency
 of a private key with the public key in an X509 certificate or certificate
-request.
+request
 
 =head1 SYNOPSIS