Speakup Howto correction for the "Debian Installation" section

[Gene Collins]

Hi.  I have noticed a mistype in the "Debian Installation" section of
the Speakup Howto.  If the typo was mine, I appologize.  In any case, it
needs to be corrected, so here is the info.

In the second note paragraph there is a sentence that reads:

For example, if you had a LiteTalk synthesizer on
     COM2, then you would type the command Linux speakup_synth=ltlk
     speak_ser=1.

The speak_ser=1 is in error, and should read speakup_ser=1.  Thanks for
your attention.

Gene Collins