Correct small nits reported by Rob Hooft.
diff --git a/Doc/lib/libgrp.tex b/Doc/lib/libgrp.tex
index 2942a1b..ab90485 100644
--- a/Doc/lib/libgrp.tex
+++ b/Doc/lib/libgrp.tex
@@ -15,7 +15,7 @@
list is a list of strings.
(Note that most users are not explicitly listed as members of the
group they are in according to the password database.)
-An exception is raised if the entry asked for cannot be found.
+A \code{KeyError} exception is raised if the entry asked for cannot be found.
It defines the following items: