lyrics.html spelling fix

I think this is what was intended:

Index: lyrics.html
===================================================================
RCS file: /cvs/www/lyrics.html,v
retrieving revision 1.84
diff -u -r1.84 lyrics.html
--- lyrics.html 15 Apr 2007 19:00:15 -0000      1.84
+++ lyrics.html 16 Apr 2007 17:43:28 -0000
@@ -83,7 +83,7 @@
that more than half of our efforts focus on various aspects relating to
device support.
<p>
-Most parts of the operating system (from low kernel, though to  
libraries,
+Most parts of the operating system (from low kernel, through to  
libraries,
all the way up to X, and then even to applications) use fairly obvious
interface layers, where the "communication protocols" or "argument  
passing"
mechanisms (ie. APIs) can be understood by any developer who takes the