Clean up YT heading in IOCCC28 index.html files

In particular the following diff for each README.md (with all the
index.html files rebuilt):

    -Watch the following [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse) YouTube show:
    +Watch the [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse)
    +YouTube show for this entry:

2024/cable2/README.md

@@ -1,6 +1,7 @@
 ## Award presentation:
 
-Watch the following [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse) YouTube show:
+Watch the [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse)
+YouTube show for this entry:
 
 > [IOCCC28 - 2024/cable2 - Prize in murky waters](https://www.youtube.com/watch?v=RMI5oT9U4vc)
 

2024/cable2/index.html

@@ -473,7 +473,8 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
 
 <!-- BEFORE: 1st line of markdown file: 2024/cable2/README.md -->
 <h2 id="award-presentation">Award presentation:</h2>
-<p>Watch the following <a href="https://www.youtube.com/@OurFavoriteUniverse">Our Favorite Universe</a> YouTube show:</p>
+<p>Watch the <a href="https://www.youtube.com/@OurFavoriteUniverse">Our Favorite Universe</a>
+YouTube show for this entry:</p>
 <blockquote>
 <p><a href="https://www.youtube.com/watch?v=RMI5oT9U4vc">IOCCC28 - 2024/cable2 - Prize in murky waters</a></p>
 </blockquote>