fix HTML error in authors.html

There was an "<p>" without a related "</p>".

Changed `bin/gen-authors.sh` VERSION from to "1.6 2024-04-15"
to "1.7 2024-04-16".

Run `make gen_authors` to perform the above and test under macOS.

authors.html

@@ -161,7 +161,6 @@ Jump to authors starting with: [
 <a href="#Y">Y</a>  
 <a href="#Z">Z</a>]
 </p>
-<p>
 <hr>
 <div id="A">
 <!-- A  A  A  A  A  A  A  A  A  A  A  A  A  A  A  A  A  A  A  A  A  A  A -->