add documentation for SSLeay_version(SSLEAY_DIR) and

'openssl version -d'

use some descriptions from Lutz' redundant manual page
instead of the previous ones

doc/apps/version.pod

@@ -46,6 +46,10 @@ compilation flags.
 
 platform setting.
 
+=item B<-d>
+
+OPENSSLDIR setting.
+
 =back
 
 =head1 NOTES
@@ -53,4 +57,8 @@ platform setting.
 The output of B<openssl version -a> would typically be used when sending
 in a bug report.
 
+=head1 HISTORY
+
+The B<-d> option was added in OpenSSL 0.9.7.
+
 =cut