Format fixes in html files of 2013

2013/endoh1/index.html

@@ -459,7 +459,7 @@ and to satisfy IOCCC’s size rule.</p>
 <li>Short coding.</li>
 </ul>
 <p>These led to the good obfuscation.</p>
-<p>See the <a href="#how_this_entry_works">How this entry works section</a> in detail, if you need.</p>
+<p>See the <a href="#how-this-entry-works">How this entry works section</a> in detail, if you need.</p>
 <h3 id="limitation">Limitation</h3>
 <p>This program supports only “Combinator-calculus style notation” of Lazy K.
 “Unlambda style” and “Iota and Jot” style are not supported.</p>
@@ -467,7 +467,7 @@ and to satisfy IOCCC’s size rule.</p>
 <code>(SK)</code>, “`sk”, <code>**i*i*i*ii*i*i*ii</code>, or <code>11111100011100</code>.</p>
 <p>Huge memory may be required to compile the program (about 300 MB on my machine).</p>
 <p>In addition, there are some limitations (and workarounds) mentioned in
-the <a href="#how_this_entry_works">How this entry works section</a>.</p>
+the <a href="#how-this-entry-works">How this entry works section</a>.</p>
 <p>But I think it would only matter when you run the attached programs.</p>
 <h3 id="portability">Portability</h3>
 <p>I confirmed that the program successfully worked with the following compilers:</p>