Fix typo in example (\b should be \n in string literal).

This closes SF bug #414279.
diff --git a/Doc/lib/libasyncore.tex b/Doc/lib/libasyncore.tex
index 3c42c3c..cce0d50 100644
--- a/Doc/lib/libasyncore.tex
+++ b/Doc/lib/libasyncore.tex
@@ -178,7 +178,7 @@
         self.path = path
         self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
         self.connect( (host, 80) )
-        self.buffer = 'GET %s HTTP/1.0\r\b\r\n' % self.path
+        self.buffer = 'GET %s HTTP/1.0\r\n\r\n' % self.path
         
     def handle_connect(self):
         pass