Typo and additional information about cert-chain building.

doc/ssl/SSL_CTX_load_verify_locations.pod

@@ -46,7 +46,7 @@ is performed in the ordering of the extension number, regardless of other
 properties of the certificates.
 Use the B<c_rehash> utility to create the necessary links.
 
-The certificates in B<CAfile> are only looked up when required, e.g. when
+The certificates in B<CApath> are only looked up when required, e.g. when
 building the certificate chain or when actually performing the verification
 of a peer certificate.
 
@@ -62,6 +62,9 @@ matching the parameters is found, the verification process will be performed;
 no other certificates for the same parameters will be searched in case of
 failure.
 
+When building its own certificate chain, an OpenSSL client/server will
+try to fill in missing certificates from B<CAfile>/B<CApath>.
+
 =head1 WARNINGS
 
 If several CA certificates matching the name, key identifier, and serial