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.

1998/df/README.md

@@ -111,7 +111,7 @@ I decided it would be better this way...
 These restrictions have been removed for your convenience.
 
 
-### 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 via the source.

1998/df/index.html

@@ -480,7 +480,7 @@ some restrictions on the file name:</p>
 My first private version would only run when compiled on a Friday.
 I decided it would be better this way…
 These restrictions have been removed for your convenience.</p>
-<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 via the source.</p>
 <p>If you get stuck, come back and read below for additional hints and information.</p>

1998/dorssel/README.md

@@ -112,7 +112,7 @@ is the same as
 ```
 
 
-### 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 running the command below.
@@ -124,7 +124,7 @@ If you get stuck, come back and run the following command:
 ```
 
 
-### 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 via the source.

1998/dorssel/index.html

@@ -466,12 +466,12 @@ text that can be reversibly Morsified, i.e.</li>
 <pre><code>    ./dorssel &lt; dorssel.c | ./dorssel | ./dorssel | ./dorssel</code></pre>
 <p>is the same as</p>
 <pre><code>    ./dorssel &lt; dorssel.c | ./dorssel</code></pre>
-<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 running the command below.</p>
 <p>If you get stuck, come back and run the following command:</p>
 <pre><code>    ./dorssel &lt; dorssel.md</code></pre>
-<h3 id="notice-to-those-who-wish-for-a-greater-challenge-1">NOTICE to those who wish for a greater challenge</h3>
+<h3 id="notice-to-those-who-wish-for-a-greater-challenge-1">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 via the source.</p>
 <p>If you get stuck, come back and read below for additional hints and information.</p>

1998/schnitzi/README.md

@@ -116,7 +116,7 @@ looping.  To see the resulting program run, redirect the output from
 and then compile it.
 
 
-### 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 via the source.

1998/schnitzi/index.html

@@ -470,7 +470,7 @@ looping. To see the resulting program run, redirect the output from
 <code>schnitzi</code> into another file, like this</p>
 <pre><code>    ./schnitzi 4 &gt; sort.c</code></pre>
 <p>and then compile it.</p>
-<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 via the source.</p>
 <p>If you get stuck, come back and read below for additional hints and information.</p>

1998/tomtorfs/README.md

@@ -99,7 +99,7 @@ Count the number of non-whitespace characters in the source
 file to find out what dark force drove me to write this ;-).
 
 
-### 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 via the source.

1998/tomtorfs/index.html

@@ -445,7 +445,7 @@ valid exit value to indicate failure (replace them with <code>EOF</code> resp.
 <h3 id="special-notes">Special notes</h3>
 <p>Count the number of non-whitespace characters in the source
 file to find out what dark force drove me to write this ;-).</p>
-<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 via the source.</p>
 <p>If you get stuck, come back and read below for additional hints and information.</p>