Don't mention SSL methods that aren't reachable in docs

Author: Michael Paquier <michael.paquier@gmail.com>

doc/src/sgml/libpq.sgml

@@ -1984,8 +1984,7 @@ const char *PQsslAttribute(const PGconn *conn, const char *attribute_name);
           <listitem>
            <para>
              SSL/TLS version in use. Common values
-             are <literal>"SSLv2"</literal>, <literal>"SSLv3"</literal>,
-             <literal>"TLSv1"</literal>, <literal>"TLSv1.1"</literal>
+             are <literal>"TLSv1"</literal>, <literal>"TLSv1.1"</literal>
              and <literal>"TLSv1.2"</literal>, but an implementation may
              return other strings if some other protocol is used.
            </para>

doc/src/sgml/sslinfo.sgml

@@ -47,8 +47,8 @@
     </term>
     <listitem>
     <para>
-     Returns the name of the protocol used for the SSL connection (e.g. SSLv2,
-     SSLv3, or TLSv1).
+     Returns the name of the protocol used for the SSL connection (e.g. TLSv1.0
+     TLSv1.1, or TLSv1.2).
     </para>
     </listitem>
    </varlistentry>