Show '\011', '\012', and '\015' as '\t', '\n', '\r' in strings.
Switch from octal escapes to hex escapes for other nonprintable characters.
diff --git a/Doc/lib/liblinecache.tex b/Doc/lib/liblinecache.tex
index f491d4c..8a9b914 100644
--- a/Doc/lib/liblinecache.tex
+++ b/Doc/lib/liblinecache.tex
@@ -41,5 +41,5 @@
 \begin{verbatim}
 >>> import linecache
 >>> linecache.getline('/etc/passwd', 4)
-'sys:x:3:3:sys:/dev:/bin/sh\012'
+'sys:x:3:3:sys:/dev:/bin/sh\n'
 \end{verbatim}