convert spoiler language and towards deobfuscation language

2014/endoh1/index.html

@@ -432,7 +432,7 @@ more than 1000 words.</p>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <h3 id="remarks">Remarks</h3>
 <p>You may want to use a large display with a very small terminal font.</p>
-<h3 id="spoiler">Spoiler</h3>
+<h3 id="deobfuscation">Deobfuscation</h3>
 <p>See <a href="spoilers.html">spoilers.html</a>.</p>
 <!--