Fix typos in SSL_CTX_use_certificate.pod file

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18087)

doc/man3/SSL_CTX_use_certificate.pod

@@ -92,10 +92,10 @@ SSL_CTX_use_PrivateKey() adds B<pkey> as private key to B<ctx>.
 SSL_CTX_use_RSAPrivateKey() adds the private key B<rsa> of type RSA
 to B<ctx>. SSL_use_PrivateKey() adds B<pkey> as private key to B<ssl>;
 SSL_use_RSAPrivateKey() adds B<rsa> as private key of type RSA to B<ssl>.
-If a certificate has already been set and the private does not belong
-to the certificate an error is returned. To change a certificate, private
-key pair the new certificate needs to be set with SSL_use_certificate()
-or SSL_CTX_use_certificate() before setting the private key with
+If a certificate has already been set and the private key does not belong
+to the certificate an error is returned. To change a [certificate/private-key]
+pair, the new certificate needs to be set first with SSL_use_certificate() or
+SSL_CTX_use_certificate() before setting the private key with
 SSL_CTX_use_PrivateKey() or SSL_use_PrivateKey().
 
 SSL_CTX_use_cert_and_key() and SSL_use_cert_and_key() assign the X.509
@@ -149,7 +149,8 @@ Files of type SSL_FILETYPE_PEM can contain more than one item.
 
 SSL_CTX_use_certificate_chain_file() adds the first certificate found
 in the file to the certificate store. The other certificates are added
-to the store of chain certificates using L<SSL_CTX_add1_chain_cert(3)>. Note: versions of OpenSSL before 1.0.2 only had a single
+to the store of chain certificates using L<SSL_CTX_add1_chain_cert(3)>.
+Note: versions of OpenSSL before 1.0.2 only had a single
 certificate chain store for all certificate types, OpenSSL 1.0.2 and later
 have a separate chain store for each type. SSL_CTX_use_certificate_chain_file()
 should be used instead of the SSL_CTX_use_certificate_file() function in order