convert spoiler language and towards deobfuscation language

2015/endoh3/README.md

@@ -64,7 +64,7 @@ the source code from all angles..
 * Find `main()` function.
 
 
-### Spoiler
+### Deobfuscation
 
 This program is a joke PDP-11 emulator.  ("ll-dpd" is embedded in the code.
 Read it upside down.)

2015/endoh3/index.html

@@ -438,7 +438,7 @@ the same reason. But I believe it is reasonably portable.</li>
 the source code from all angles..</li>
 <li>Find <code>main()</code> function.</li>
 </ul>
-<h3 id="spoiler">Spoiler</h3>
+<h3 id="deobfuscation">Deobfuscation</h3>
 <p>This program is a joke PDP-11 emulator. (“ll-dpd” is embedded in the code.
 Read it upside down.)</p>
 <p>You got it? This program is supposed to be used in this way:</p>