Fixes in 1986, manifest update

The html files in 1986 (including 1986/marshall/compilers.html) look and
feel good. Format change (slight) in 1986/marshall/index.html.

The manifest update includes a fix for 1986/hague and this same change
in entry_text applies to files in a few other years as well.

1986/marshall/compilers.html

@@ -445,7 +445,7 @@ change to <code>_exit()</code>.</p>
 <p>And that is the tale of a little <del>engine</del> train that
 could…eventually! Or perhaps it’s the compilers, optimisers and OSes that
 eventually could?</p>
-<p>Whichever you wish it to be, it now works with both <code>clang</code> and <code>cc</code> Choo choo!</p>
+<p>Whichever you wish it to be, it now works with both <code>clang</code> and <code>cc</code>. Choo choo!</p>
 <hr style="width:10%;text-align:left;margin-left:0">
 <p>Jump to: <a href="#">top</a></p>
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