For ratecv, document that None should be the initial state argument (when
I was squashing spurious overflows in the implementation, I got hung up
on this point).
diff --git a/Doc/lib/libaudioop.tex b/Doc/lib/libaudioop.tex
index 00a91d1..06b1c27 100644
--- a/Doc/lib/libaudioop.tex
+++ b/Doc/lib/libaudioop.tex
@@ -163,7 +163,8 @@
\var{state} is a tuple containing the state of the converter. The
converter returns a tuple \code{(\var{newfragment}, \var{newstate})},
and \var{newstate} should be passed to the next call of
-\function{ratecv()}.
+\function{ratecv()}. The initial call should pass \code{None}
+as the state.
The \var{weightA} and \var{weightB} arguments are parameters for a
simple digital filter and default to \code{1} and \code{0} respectively.