update with new beta description

diff --git a/doc/format.html b/doc/format.html
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@@ -55,7 +55,7 @@
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-               This is a detailed description of the FLAC format.  The format is still in an alpha stage, which means it can change (even breaking old streams) until the first beta, so if you are a developer, <A HREF="http://sourceforge.net/mail/?group_id=13478">join the mailing list</A> or check back regularly.
+               This is a detailed description of the FLAC format.  The format is currently in the beta stage, which means it will not change in a way that will break backward compatibility unless a bug related to the format is found.  Until the first official release you should probably not use FLAC for archiving unless you keep your beta binaries around.
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        <P>
                First, as the original developer I have to say that I am not a compression expert and I feel obligated to give credit where it is due.  FLAC owes a lot to the many people who have advanced the audio compression field so freely.  For instance: