Lots of small corrections by Andrew Kuchling (plus all new rotor docs)
diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex
index ba6b896..cd2c646 100644
--- a/Doc/lib/libsys.tex
+++ b/Doc/lib/libsys.tex
@@ -57,7 +57,7 @@
exception is not handled and the interpreter prints an error message
and a stack traceback. Their intended use is to allow an interactive
user to import a debugger module and engage in post-mortem debugging
- without having to re-execute the command that cause the error (which
+ without having to re-execute the command that caused the error (which
may be hard to reproduce). The meaning of the variables is the same
as that of \code{exc_type}, \code{exc_value} and \code{exc_tracaback},
respectively.