doc: Small wording improvement

doc/src/sgml/config.sgml

@@ -1356,16 +1356,16 @@ include_dir 'conf.d'
       </term>
       <listitem>
        <para>
-        This setting determines whether the passphrase command set by
+        This parameter determines whether the passphrase command set by
         <varname>ssl_passphrase_command</varname> will also be called during a
         configuration reload if a key file needs a passphrase.  If this
-        setting is false (the default), then
+        parameter is false (the default), then
         <varname>ssl_passphrase_command</varname> will be ignored during a
         reload and the SSL configuration will not be reloaded if a passphrase
         is needed.  That setting is appropriate for a command that requires a
         TTY for prompting, which might not be available when the server is
-        running.  Setting this to true might be appropriate if the passphrase
-        is obtained from a file, for example.
+        running.  Setting this parameter to true might be appropriate if the
+        passphrase is obtained from a file, for example.
        </para>
        <para>
         This parameter can only be set in the <filename>postgresql.conf</filename>