fix problematic HTML caused by certain trailing backslashes

In cases that are **outside of a markdown code block**,
a markdown line with ending in a tailing "\" can generate
problematic HTML.

We certain trailing backslashes outside of a markdown code block
with "<br>" HTML elements, or in some cases eliminated the
need for a trailing backslash.

In a few cases some unnecessary trailing backslashes inside
of a markdown code block were removed.

The following markdown files were changed in this commit:

```
1990/dds/README.md
1990/jaw/README.md
1991/ant/README.md
1991/rince/README.md
1991/westley/README.md
1992/vern/README.md
1992/westley/README.md
1998/schweikh1/README.md
2004/anonymous/README.md
2005/sykes/README.md
2006/toledo2/README.md
2011/toledo/README.md
2012/endoh2/README.md
2012/tromp/README.md
2013/robison/README.md
2015/hou/README.md
2015/howe/README.md
2015/schweikhardt/README.md
2018/burton1/README.md
2018/burton2/README.md
2018/ferguson/README.md
2018/vokes/README.md
2020/ferguson1/README.md
```

Performed `make www` to test these changes.

2004/anonymous/README.md

@@ -68,9 +68,11 @@ it. The real text is:
 which when translated from [Black
 Speech](https://www.glyphweb.com/arda/b/blackspeech.html) means:
 
-> [One Ring](https://www.glyphweb.com/arda/o/onering.html) to rule them all, [One
-Ring](https://www.glyphweb.com/arda/o/onering.html) to find them,\
-> [One Ring](https://www.glyphweb.com/arda/o/onering.html) to bring them all and in the darkness bind them.
+```
+    [One Ring](https://www.glyphweb.com/arda/o/onering.html) to rule them all,
+    [One Ring](https://www.glyphweb.com/arda/o/onering.html) to find them,
+    [One Ring](https://www.glyphweb.com/arda/o/onering.html) to bring them all and in the darkness bind them.
+```
 
 
 ## Author's remarks:

2004/anonymous/index.html

@@ -195,11 +195,9 @@ burzum-ishi krimpatul.</p>
 </blockquote>
 <p>which when translated from <a href="https://www.glyphweb.com/arda/b/blackspeech.html">Black
 Speech</a> means:</p>
-<blockquote>
-<p><a href="https://www.glyphweb.com/arda/o/onering.html">One Ring</a> to rule them all, <a href="https://www.glyphweb.com/arda/o/onering.html">One
-Ring</a> to find them,<br />
-<a href="https://www.glyphweb.com/arda/o/onering.html">One Ring</a> to bring them all and in the darkness bind them.</p>
-</blockquote>
+<pre><code>    [One Ring](https://www.glyphweb.com/arda/o/onering.html) to rule them all,
+    [One Ring](https://www.glyphweb.com/arda/o/onering.html) to find them,
+    [One Ring](https://www.glyphweb.com/arda/o/onering.html) to bring them all and in the darkness bind them.</code></pre>
 <h2 id="authors-remarks">Author’s remarks:</h2>
 <p>This program takes a single command line argument, transcribes the
 argument text into Tolkien’s Elvish letters, and writes the