Reference the correct image...

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74106 91177308-0d34-0410-b5e6-96231b3b80d8

www/analyzer/annotations.html

@@ -95,7 +95,7 @@ int foo(int *p, int *q) {
 <p>Running <tt>scan-build</tt> over this source produces the following
 output:</p>
 
-<img src="images/example_cf_returns_retained_gc.png">
+<img src="images/xample_attribute_nonnull.png">
 
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 <h2 id="macosx">Mac OS X API Annotations</h2>