Fix doc-nits from previous commit

Reviewed-by: NAndy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4325)

doc/man3/DH_generate_parameters.pod

@@ -122,7 +122,7 @@ L<DH_free(3)>
 
 =head1 HISTORY
 
-DH_generate_parameters() was deprecated in OpenSSL version 0.9.8; use
+DH_generate_parameters() was deprecated in OpenSSL 0.9.8; use
 DH_generate_parameters_ex() instead.
 
 =head1 COPYRIGHT

doc/man3/DSA_generate_parameters.pod

@@ -111,7 +111,7 @@ L<DSA_free(3)>, L<BN_generate_prime(3)>
 
 =head1 HISTORY
 
-DSA_generate_parameters() was deprecated in OpenSSL version 0.9.8; use
+DSA_generate_parameters() was deprecated in OpenSSL 0.9.8; use
 DSA_generate_parameters_ex() instead.
 
 =head1 COPYRIGHT

doc/man3/RAND_cleanup.pod

@@ -12,6 +12,8 @@ RAND_cleanup - erase the PRNG state
  void RAND_cleanup(void)
  #endif
 
+=head1 DESCRIPTION
+
 Prior to OpenSSL 1.1.0, RAND_cleanup() released all resources used by
 the PRNG.  As of version 1.1.0, it does nothing and should not be called,
 since no explicit initialisation or de-initialisation is necessary. See