Rob W. W. Hooft's spelling fixes for the Library Reference. I hope
SourceForge doesn't choke on this batch :-)

I'm not entirely sure this is 100% correct. The patch changes an
\index{persistency} to \index{presistence}, and I don't know what \index{}
does. But it seems to do so persi--er, consistently, so I hope it isn't a
problem.
diff --git a/Doc/lib/libaudioop.tex b/Doc/lib/libaudioop.tex
index 88bf046..00a91d1 100644
--- a/Doc/lib/libaudioop.tex
+++ b/Doc/lib/libaudioop.tex
@@ -151,7 +151,7 @@
 \end{funcdesc}
 
 \begin{funcdesc}{mul}{fragment, width, factor}
-Return a fragment that has all samples in the original framgent
+Return a fragment that has all samples in the original fragment
 multiplied by the floating-point value \var{factor}.  Overflow is
 silently ignored.
 \end{funcdesc}
@@ -161,7 +161,7 @@
 Convert the frame rate of the input fragment.
 
 \var{state} is a tuple containing the state of the converter.  The
-converter returns a tupl \code{(\var{newfragment}, \var{newstate})},
+converter returns a tuple \code{(\var{newfragment}, \var{newstate})},
 and \var{newstate} should be passed to the next call of
 \function{ratecv()}.