Remove an uninteresting note

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174441 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/NOTES.txt b/NOTES.txt
index 1c89d68..107ec5a 100644
--- a/NOTES.txt
+++ b/NOTES.txt
@@ -2,9 +2,6 @@
 // Random Notes
 //===---------------------------------------------------------------------===//
 
-C90/C99/C++ Comparisons:
-http://david.tribble.com/text/cdiffs.htm
-
 //===---------------------------------------------------------------------===//
 
 To time GCC preprocessing speed without output, use: