Add note for Mac OS X developers.

llvm-svn: 27175
diff --git a/llvm/docs/TestingGuide.html b/llvm/docs/TestingGuide.html
index 2f88ada..ca21ade 100644
--- a/llvm/docs/TestingGuide.html
+++ b/llvm/docs/TestingGuide.html
@@ -88,6 +88,9 @@
 filenames themselves on the <tt>configure</tt> line.</li>
 </ul></dd>
 </dl>
+
+<p>Mac OS X developers can simplify installation of Expect and tcl by using
+fink.  <tt>fink install expect</tt> will install both.</p>
 </div>
 
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