variable name fix in docs of Markdown helper

f2258e760f (commitcomment-3165819)

framework/helpers/base/Markdown.php

@@ -16,13 +16,13 @@ use Michelf\MarkdownExtra;
  * Basic usage is the following:
  *
  * ```php
- * $my_html = Markdown::process($my_text);
+ * $myHtml = Markdown::process($myText);
  * ```
  *
  * If you want to configure the parser:
  *
  * ```php
- * $my_html = Markdown::process($my_text, array(
+ * $myHtml = Markdown::process($myText, array(
  *     'fn_id_prefix' => 'footnote_',
  * ));
  * ```