Don't check status of logical replication slots

We only want to check the status of physical replication slots
to determine whether a streaming replication standby has become
detached and there is therefore a risk of uncontrolled WAL buildup
on the local node.

It's not feasible to second-guess the state of logical replication
slots.

doc/appendix-release-notes.sgml

@@ -17,7 +17,7 @@
 
   <sect1 id="release-4.3">
     <title>Release 4.3</title>
-    <para><emphasis>Feb ???, 2019</emphasis></para>
+    <para><emphasis>Mar ???, 2019</emphasis></para>
     <para>
       &repmgr; 4.3 is a major release.
     </para>
@@ -214,6 +214,15 @@ REPMGRD_OPTS="--daemonize=false"</programlisting>
             </para>
 		  </listitem>
 
+          <listitem>
+            <para>
+              <command><link linkend="repmgr-node-check">repmgr node check</link></command>
+			  will only consider physical replication slots, as the purpose
+			  of slot checks is to warn about potential issues with
+			  streaming replication standbys which are no longer attached.
+			</para>
+		  </listitem>
+
         </itemizedlist>
       </para>
     </sect2>