doc: note use of wildcards in .pgpass file

doc/configuration-password-management.xml

@@ -142,6 +142,16 @@ node3:5432:repmgr:postgres:foo
 node3:5432:replication:repluser:foo</programlisting>
     </para>
 
+    <para>
+      The <filename>~/.pgpass</filename> file can be simplified with the use of wildcards if
+      there is no requirement to restrict provision of passwords to particular hosts, ports
+      or databases. The preceding file could then be formatted like this:
+        <programlisting>
+*:*:*:repmgr:foo
+*:*:*:postgres:foo
+</programlisting>
+    </para>
+
     <note>
       <para>
         It's possible to specify an alternative location for the <filename>~/.pgpass</filename> file, either via