Slight change in 'greater challenge' line

In the line in README.md and index.html files that said:

    ### NOTICE to those who wish for a greater challenge

I added a ':' at the end of the line.

There were some entries that had a link fix in the index.html file but I
only looked up through 1995/leo as those still have to have a 'look and
feel' check and it would just slow things down.

1994/tvr/README.md

@@ -5,7 +5,7 @@
 ```
 
 
-The author provided a spoiler version as alternate code. See [Alternate
+The author provided a less obfuscated version as alternate code. See [Alternate
 code](#alternate-code) below.
 
 
@@ -40,7 +40,7 @@ Mode may be a value from 0 to 12.
 ## Alternate code:
 
 
-### NOTICE to those who wish for a greater challenge
+### NOTICE to those who wish for a greater challenge:
 
 **If you want a greater challenge, don't read any further**:
 just try to understand the program without looking at the Alternate code.

1994/tvr/index.html

@@ -403,7 +403,7 @@ Location: <a href="../../location.html#FI">FI</a> - <em>Republic of Finland </em
 <!-- BEFORE: 1st line of markdown file: 1994/tvr/README.md -->
 <h2 id="to-build">To build:</h2>
 <pre><code>    make all</code></pre>
-<p>The author provided a spoiler version as alternate code. See <a href="#alternate-code">Alternate
+<p>The author provided a less obfuscated version as alternate code. See <a href="#alternate-code">Alternate
 code</a> below.</p>
 <h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
 <p>The current status of this entry is:</p>
@@ -416,7 +416,7 @@ code</a> below.</p>
 <pre><code>    ./try.color.sh              # for colour displays
     ./try.bw.sh                 # for Black &amp; White displays</code></pre>
 <h2 id="alternate-code">Alternate code:</h2>
-<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge</h3>
+<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge:</h3>
 <p><strong>If you want a greater challenge, don’t read any further</strong>:
 just try to understand the program without looking at the Alternate code.</p>
 <p>If you get stuck, come back and look at the Alternate code.</p>