Improve Windows time.clock() blurb; was missing return type and unit.
diff --git a/Doc/lib/libtime.tex b/Doc/lib/libtime.tex
index 83d520e..2e9de60 100644
--- a/Doc/lib/libtime.tex
+++ b/Doc/lib/libtime.tex
@@ -134,10 +134,10 @@
the function to use for benchmarking\index{benchmarking} Python or
timing algorithms.
-On Windows, this function returns the nearest approximation to
-wall-clock time since the first call to this function, based on the
-Win32 function \cfunction{QueryPerformanceCounter()}. The resolution
-is typically better than one microsecond.
+On Windows, this function returns wall-clock seconds elapsed since the
+first call to this function, as a floating point number,
+based on the Win32 function \cfunction{QueryPerformanceCounter()}.
+The resolution is typically better than one microsecond.
\end{funcdesc}
\begin{funcdesc}{ctime}{\optional{secs}}