fix internal links in entry index.html from 1984 thru 2012

1990/jaw/index.html

@@ -177,7 +177,7 @@ sentence.</p>
 </ul>
 <p>Included with this entry is a shell script (with comments edited down to reduce
 it to 1530 bytes) which implements the complete shark utility. The script,
-<a href="shark.sh">shark.sh</a>, contains a <code>jaw.c</code> embedded within it!</p>
+<a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1990/jaw/shark.sh">shark.sh</a>, contains a <code>jaw.c</code> embedded within it!</p>
 <p>The sender must have <code>compress</code> and <code>btoa</code>. To send, try:</p>
 <pre><code>    ./shark.sh jaw.* README.md &gt; receive</code></pre>
 <p>The resulting file, <code>receive</code>, unpacks the input files