Add more instructions to "how to delete a branch no longer in support"

and fix pre-existing bug.  While here, bump copyright date.

en_US.ISO8859-1/articles/portbuild/article.sgml

@@ -23,6 +23,7 @@
       <year>2009</year>
       <year>2010</year>
       <year>2011</year>
+      <year>2012</year>
       <holder role="mailto:portmgr@FreeBSD.org">The &os; Ports
 	Management Team</holder>
     </copyright>
@@ -2221,7 +2222,7 @@ ln -s ../<replaceable>arch</replaceable>/<replaceable>branch</replaceable>/build
 	  with the following changes:</para>
 	  <itemizedlist>
 	    <listitem>
-	      <para>Delete <replaceable>new-branch</replaceable> from
+	      <para>Delete <replaceable>old-branch</replaceable> from
 		<makevar>SRC_BRANCHES</makevar>.</para>
 	    </listitem>
 
@@ -2240,6 +2241,40 @@ umount a/snap/src-<replaceable>old-branch</replaceable>;
 zfs destroy -r a/snap/src-<replaceable>old-branch</replaceable></command></para>
       </listitem>
     </itemizedlist>
+
+    <itemizedlist>
+      <listitem>
+	<para>(both) You will probably find that the following files and
+	  symlinks in <filename>/var/portbuild/errorlogs/</filename>
+	  can be removed:</para>
+	  <itemizedlist>
+	    <listitem>
+	      <para>Files named
+		<filename>*-<replaceable>old_branch</replaceable>-failure.html</filename>
+	      </para>
+	    </listitem>
+
+	    <listitem>
+	      <para>Files named
+		<filename>buildlogs_*-<replaceable>old_branch</replaceable>-*-logs.txt</filename>
+	      </para>
+	    </listitem>
+
+	    <listitem>
+	      <para>Symlinks named
+		<filename>*-<replaceable>old_branch</replaceable>-previous*</filename>
+	      </para>
+	    </listitem>
+
+	    <listitem>
+	      <para>Symlinks named
+		<filename>*-<replaceable>old_branch</replaceable>-latest*</filename>
+	      </para>
+	    </listitem>
+
+	  </itemizedlist>
+      </listitem>
+    </itemizedlist>
   </sect1>
 
   <sect1 id="rebase-branch">