[clang][www] Remove ClangDataFormat.py from docs (#117943)

The script was removed in #96385. Instead, mention the LLVM formatter as it's still very useful for Clang's code.

Author: emaxx-google

clang/www/hacking.html

@@ -89,9 +89,9 @@ <h2 id="debugging">Debugging</h2>
  qualifiers, and the <tt>getTypePtr()</tt> method to get the
  wrapped <tt>Type*</tt> which you can then dump.</li>
  <li>For <a href="https://lldb.llvm.org"> <tt>LLDB</tt></a> users there are
- data formatters for clang data structures in
- <a href="https://github.com/llvm/llvm-project/blob/main/clang/utils/ClangDataFormat.py">
- <tt>clang/utils/ClangDataFormat.py</tt></a>.</li>
+ data formatters for LLVM data structures in
+ <a href="https://github.com/llvm/llvm-project/blob/main/llvm/utils/lldbDataFormatters.py">
+ <tt>llvm/utils/lldbDataFormatters.py</tt></a>.</li>
  </ul>
 
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