Correct small nits reported by Rob Hooft.
diff --git a/Doc/lib/libpwd.tex b/Doc/lib/libpwd.tex
index 073c19a..82ebd61 100644
--- a/Doc/lib/libpwd.tex
+++ b/Doc/lib/libpwd.tex
@@ -15,7 +15,7 @@
 \code{pw_dir},
 \code{pw_shell}.
 The uid and gid items are integers, all others are strings.
-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: