Advise porters that as part of the porting process, make readme

should also be tested.
In addition to that, document that post-deinstall is not a valid
target and is not run by the ports infrastructure.

PR:		docs/166502
Submitted by:	jgh

en_US.ISO8859-1/books/porters-handbook/book.sgml

@@ -345,6 +345,10 @@ PLIST_DIRS=	lib/X11/oneko</programlisting>
 	<step>
 	  <para><command>make package</command></para>
 	</step>
+
+	<step>
+	  <para><command>make readme</command></para>
+	</step>
       </procedure>
 
       <para>Make sure that there are not any warnings issued in any of
@@ -576,7 +580,9 @@ PLIST_DIRS=	lib/X11/oneko</programlisting>
 	  intended to be changed.  If you want to fix the extraction,
 	  fix <maketarget>do-extract</maketarget>, but never ever
 	  change the way <maketarget>extract</maketarget>
-	  operates!</para>
+	  operates! Additionally, the target
+          <maketarget>post-deinstall</maketarget> is invalid and
+          is not run by the ports infrastructure.</para>
       </note>
 
       <para>Now that you understand what goes on when the user types