Add missing colon to docs.

doc/src/sgml/runtime.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.418 2008/09/30 10:52:10 heikki Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.419 2008/11/04 04:18:50 momjian Exp $ -->
 
 <chapter Id="runtime">
  <title>Operating System Environment</title>
@@ -1743,7 +1743,7 @@ openssl req -x509 -in server.req -text -key server.key -out server.crt
 </programlisting>
     to turn the certificate into a self-signed certificate and to copy
     the key and certificate to where the server will look for them.
-    Finally do
+    Finally do:
 <programlisting>
 chmod og-rwx server.key
 </programlisting>