Doc: Fix misleading wording of CRL parameters

ssl_crl_file and ssl_crl_dir are both used to for client certificate
revocation, not server certificates.  The description for the params
could be easily misread to mean the opposite however,  as evidenced
by the bugreport leading to this fix.  Similarly, expand sslcrl and
and sslcrldir to explicitly mention server certificates. While there
also mention sslcrldir where previously only sslcrl was discussed.

Backpatch down to v10, with the CRL dir fixes down to 14 where they
were introduced.

Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Discussion: https://postgr.es/m/20211202.135441.590555657708629486.horikyota.ntt@gmail.com
Discussion: https://postgr.es/m/CABWY_HCBUCjY1EJHrEGePGEaSZ5b29apgTohCyygtsqe_ySYng@mail.gmail.com
Backpatch-through: 10

doc/src/sgml/config.sgml

@@ -1248,7 +1248,7 @@ include_dir 'conf.d'
       </term>
       <listitem>
        <para>
-        Specifies the name of the file containing the SSL server certificate
+        Specifies the name of the file containing the SSL client certificate
         revocation list (CRL).
         Relative paths are relative to the data directory.
         This parameter can only be set in the <filename>postgresql.conf</filename>
@@ -1267,7 +1267,7 @@ include_dir 'conf.d'
       </term>
       <listitem>
        <para>
-        Specifies the name of the directory containing the SSL server
+        Specifies the name of the directory containing the SSL client
         certificate revocation list (CRL).  Relative paths are relative to the
         data directory.  This parameter can only be set in
         the <filename>postgresql.conf</filename> file or on the server command

doc/src/sgml/libpq.sgml

@@ -1742,7 +1742,7 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslcrl</literal></term>
       <listitem>
        <para>
-        This parameter specifies the file name of the SSL certificate
+        This parameter specifies the file name of the SSL server certificate
         revocation list (CRL).  Certificates listed in this file, if it
         exists, will be rejected while attempting to authenticate the
         server's certificate.  If neither
@@ -1758,7 +1758,7 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslcrldir</literal></term>
       <listitem>
        <para>
-        This parameter specifies the directory name of the SSL certificate
+        This parameter specifies the directory name of the SSL server certificate
         revocation list (CRL).  Certificates listed in the files in this
         directory, if it exists, will be rejected while attempting to
         authenticate the server's certificate.
@@ -8374,6 +8374,8 @@ ldap://ldap.acme.com/cn=dbserver,cn=hosts?pgconnectinfo?base?(objectclass=*)
    setting
    the connection parameters <literal>sslrootcert</literal> and <literal>sslcrl</literal>
    or the environment variables <envar>PGSSLROOTCERT</envar> and <envar>PGSSLCRL</envar>.
+   <literal>sslcrldir</literal> or the environment variable <envar>PGSSLCRLDIR</envar>
+   can also be used to specify a directory containing CRL files.
   </para>
 
   <note>

doc/src/sgml/runtime.sgml

@@ -2340,7 +2340,8 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
    you wish to avoid storing them on clients (assuming the root and
    intermediate certificates were created with <literal>v3_ca</literal>
    extensions).  Certificate Revocation List (CRL) entries are also
-   checked if the parameter <xref linkend="guc-ssl-crl-file"/> is set.
+   checked if the parameter <xref linkend="guc-ssl-crl-file"/> or
+   <xref linkend="guc-ssl-crl-dir"/> is set.
   </para>
 
   <para>