convert spoiler filenames into deobfuscation filenames

2018/burton2/index.html

@@ -782,7 +782,7 @@ are not recognised when written as <code>-rs</code> in prose).</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton2/spotcheck.sh">spotcheck.sh</a> - script to test a lot of files vs iocccsize</li>
 <li><a href="v7unix">v7unix</a> - reserved words for a v7 UNIX C standard</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2018/burton2/spotdiff.sh">spotdiff.sh</a> - summarize the results of spotcheck</li>
-<li><a href="src.doc.txt">src.doc.txt</a> - spoiler - hints about the source code</li>
+<li><a href="src.doc.txt">src.doc.txt</a> - deobfuscation hints about the source code</li>
 </ul>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>