Fixing variable names, now working with v2.5.12

Author: S1SYPHOS

core/syntax_highlight.php

@@ -17,7 +17,7 @@
  // Converting kirbytext to an HTML document
  // See https://secure.php.net/manual/en/class.domdocument.php
  $html = new DOMDocument();
- $html->loadHTML($text, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
+ $html->loadHTML($value);
 
  // Retrieving all `pre` elements inside our newly created HTML document
  // See https://secure.php.net/manual/en/class.domxpath.php & https://en.wikipedia.org/wiki/XPath
@@ -30,7 +30,7 @@
  }
 
  // Saving all changes
- $text = $html->saveHTML();
+ $value = $html->saveHTML();
 
 
  /*