convert spoiler language and towards deobfuscation language

1998/dorssel/index.html

@@ -468,7 +468,7 @@ text that can be reversibly Morsified, i.e.</li>
 <pre><code>    ./dorssel &lt; dorssel.c | ./dorssel</code></pre>
 <ul>
 <li>The file <a href="dorssel.html">dorssel.html</a> contains all the information needed to
-understand this program. For an obfuscated spoiler, try</li>
+understand this program. For deobfuscation information, try:</li>
 </ul>
 <pre><code>    ./dorssel &lt; dorssel.md</code></pre>
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