Doc: Use past tense for things which happened in the past

The paragraph on SSL compression is largely describing events which
took place many years ago, so reword with past tense.

Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/eac70d46-e61c-4d71-a1e1-78e2bfa19485@eisentraut.org

Author: danielgustafsson

doc/src/sgml/libpq.sgml

@@ -1840,11 +1840,11 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
 
        <para>
         SSL compression is nowadays considered insecure and its use is no
-        longer recommended.  <productname>OpenSSL</productname> 1.1.0 disables
+        longer recommended.  <productname>OpenSSL</productname> 1.1.0 disabled
         compression by default, and many operating system distributions
-        disable it in prior versions as well, so setting this parameter to on
+        disabled it in prior versions as well, so setting this parameter to on
         will not have any effect if the server does not accept compression.
-        <productname>PostgreSQL</productname> 14 disables compression
+        <productname>PostgreSQL</productname> 14 disabled compression
         completely in the backend.
        </para>