update re tchrist's comments on perl 4

The Perl 4 code I wrote wasn't perl 4 code.
Tom Christian rightly pointed out that perl 4 doesn't even have references.

Make it clear I started off writing Perl 5 code that was inspired by Perl 4's lack of Objects, not I started off writing Perl 4 code.

2024/articles/2024-12-24.pod

@@ -66,9 +66,9 @@ years we've seen some of these experiments being turned into best practices that
  are built into the language itself.
 
 When I first learned Perl in 1998, I started with the "pink" version of Larry
-Wall's "Programming Perl" book.  This talked about Perl 4, Perl before we even
-had objects.  If I wanted to represent a triangle and try to calculate its area
-I might have written code something like this:
+Wall's "Programming Perl" book, which only covered Perl 4 and hence didn't cover
+the topic of objects I<at all>.  This resulted in some of the first Perl 5 code
+I wrote looking like this:
 
 =begin perl
 
@@ -84,9 +84,10 @@ print "triangle_area($shape), "\n";
 
 My understanding of Perl changed pretty quickly when I started reading the
 man pages for the version of Perl I had installed and got my hands on the
-"blue" second edition of "Programming Perl" which talked about Perl 5.
+"blue" second edition of "Programming Perl".
 
-Perl 5 had objects and the kind of Perl I would write would be more like this:
+Learning Perl 5's object model meant the kind of Perl I would write would be
+more like this:
 
 =begin perl