convert more spoiler into deobfuscation

2020/ferguson1/HACKING.html

@@ -495,7 +495,7 @@ left it might be:</p>
 Please note that modifier keys like ctrl aren’t detectable or at least I’m
 unaware of how to do so.</p>
 <h2 id="modifying-the-statusscore-line-table-of-variablesstats-below">Modifying the status/score line (table of variables/stats below)</h2>
-<h3 id="spoiler-warning">SPOILER WARNING</h3>
+<h3 id="deobfuscation-notice">DEOBFUSCATION NOTICE</h3>
 <p>Below I give a table of some variables/expressions along with the data types and
 their respective format specifiers of the data. Originally it was a lot more
 detailed but as I started obfuscating things variables started to disappear and

2020/ferguson1/HACKING.md

@@ -152,7 +152,7 @@ unaware of how to do so.
 
 ## Modifying the status/score line (table of variables/stats below)
 
-### SPOILER WARNING
+### DEOBFUSCATION NOTICE
 
 Below I give a table of some variables/expressions along with the data types and
 their respective format specifiers of the data. Originally it was a lot more

2020/ferguson1/gameplay.html

@@ -802,7 +802,7 @@ to be a problem simply do:</p>
 could also set the max size to be the highest possible by saying</p>
 <pre><code>    MAXSIZE=-1</code></pre>
 <p>Which I’ve done in the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/ferguson1/play.sh">play.sh</a> script.</p>
-<p>I discuss how this mode works in [spoilers.markdown][].</p>
+<p>I discuss how this mode works in <a href="spoilers.html">spoilers.html</a>.</p>
 <p>Here’s an example run where I spelt ‘SNAKE’. As you can see it’s far from
 perfect: the snake after all does not leave gaps and the game does not support
 diagonal movement and I also made a mistake and had to modify what I was aiming

2020/ferguson1/gameplay.md

@@ -554,7 +554,7 @@ could also set the max size to be the highest possible by saying
 
 Which I've done in the [play.sh][] script.
 
-I discuss how this mode works in [spoilers.markdown][].
+I discuss how this mode works in [spoilers.html][].
 
 Here's an example run where I spelt 'SNAKE'. As you can see it's far from
 perfect: the snake after all does not leave gaps and the game does not support