[tldoc] one more sentence

[Karl Berry]

Since we are omitting some platforms from the DVD for the first time
this year (but they're still available over the net), it seemed like
that had to be mentioned in the doc.  So, one more sentence.  Sorry...

karl

--- texlive-en.tex	(revision 30570)
+++ texlive-en.tex	(working copy)
@@ -3376,7 +3376,9 @@
 \pkgname{i386-netbsd}, and \pkgname{amd64-netbsd} added or revived;
 \pkgname{powerpc-aix} removed.  Support for some additional platforms is
 available as custom binaries
-(\url{http://tug.org/texlive/custom-bin.html}).
+(\url{http://tug.org/texlive/custom-bin.html}).  In addition, some
+platforms are omitted from the \DVD\ (simply to save space), but can be
+installed normally over the net.
 
 
 \subsection{Future}