Tweak perf example in The Basics

pages/The-Basics.md

@@ -307,16 +307,16 @@ echo ($a == 5) ? return true : return false;    // this example will output an e
 
 At times, coders attempt to make their code "cleaner" by declaring predefined variables with a different name. What
 this does in reality is to double the memory consumption of said script. For the example below, let's say
-$_GET\['about_me'\] contains 1MB worth of data, by copying the variable you've increased the scripts execution to 2MB.
+an example string of text contains 1MB worth of data, by copying the variable you've increased the scripts execution to 2MB.
 
 {% highlight php %}
 <?php
-$about = $_GET['about_me'];    // uses 2MB memory
+$about = 'A very long string of text';    // uses 2MB memory
 echo $about;
 
 vs.
 
-echo $_GET['about_me'];        // uses 1MB memory
+echo 'A very long string of text';        // uses 1MB memory
 {% endhighlight %}
 
 * [Performace tips](https://developers.google.com/speed/articles/optimizing-php)