Fix some typos.
Add an index entry.
diff --git a/Doc/lib/libsched.tex b/Doc/lib/libsched.tex
index afa9c6f..baa2ffe 100644
--- a/Doc/lib/libsched.tex
+++ b/Doc/lib/libsched.tex
@@ -7,13 +7,13 @@
\modulesynopsis{General purpose event scheduler.}
The \module{sched} module defines a class which implements a general
-purpose event scheduler:
+purpose event scheduler:\index{event scheduling}
\begin{classdesc}{scheduler}{timefunc, delayfunc}
The \class{scheduler} class defines a generic interface to scheduling
events. It needs two functions to actually deal with the ``outside world''
--- \var{timefunc} should be callable without arguments, and return
-a number (the ``time'', in any units whatsoever). The \var{delayfunc}
+a number (the ``time'', in any units whatsoever). The \var{delayfunc}
function should be callable with one argument, compatible with the output
of \var{timefunc}, and should delay that many time units.
\var{delayfunc} will also be called with the argument \code{0} after
@@ -43,9 +43,9 @@
\end{verbatim}
-\subsection{Schedule Objects \label{schedule-objects}}
+\subsection{Scheduler Objects \label{scheduler-objects}}
-\class{schdule} instances have the following methods:
+\class{scheduler} instances have the following methods:
\begin{methoddesc}{enterabs}{time, priority, action, argument}
Schedule a new event. The \var{time} argument should be a numeric type
@@ -74,7 +74,7 @@
\end{methoddesc}
\begin{methoddesc}{empty}{}
-Check whether there are no scheduled events.
+Return true if the event queue is empty.
\end{methoddesc}
\begin{methoddesc}{run}{}