When explaining the enterabs() method, using the modern spelling of apply(),
and relax the type of the argument list from tuple to sequence.
diff --git a/Doc/lib/libsched.tex b/Doc/lib/libsched.tex
index 678772d..6b586a8 100644
--- a/Doc/lib/libsched.tex
+++ b/Doc/lib/libsched.tex
@@ -55,9 +55,9 @@
the same \var{time} will be executed in the order of their
\var{priority}.
-Executing the event means executing \code{apply(\var{action},
-\var{argument})}. \var{argument} must be a tuple holding the
-parameters for \var{action}.
+Executing the event means executing
+\code{\var{action}(*\var{argument})}. \var{argument} must be a
+sequence holding the parameters for \var{action}.
Return value is an event which may be used for later cancellation of
the event (see \method{cancel()}).