convert spoiler language and towards deobfuscation language

2019/poikola/README.md

@@ -228,7 +228,7 @@ compilers. Small change in code can produce really unexpected results, i.e. the
 compiler can skip a few expressions or statements without obvious reason.
 
 
-### Major spoilers
+### Major deobfuscation
 
 It is commonly believed that [Mike Keith's
 algorithm](http://www.cadaeic.net/calendar.htm) published in _Journal of

2019/poikola/index.html

@@ -521,7 +521,7 @@ prime</a> is missing from output.</p>
 achieve exactly the same output from different optimization levels and
 compilers. Small change in code can produce really unexpected results, i.e. the
 compiler can skip a few expressions or statements without obvious reason.</p>
-<h3 id="major-spoilers">Major spoilers</h3>
+<h3 id="major-deobfuscation">Major deobfuscation</h3>
 <p>It is commonly believed that <a href="http://www.cadaeic.net/calendar.htm">Mike Keith’s
 algorithm</a> published in <em>Journal of
 Recreational Mathematics</em>, Vol. 22, No. 4, 1990, p. 280, is the shortest way to