Adding VHDL lesson 2 to the globalTutorialArr
therefore the button for it appears
fixed issue where clicking the second VHDL tutorial would read the wrong path causing a 404 error when then shows no tutorial at all.
fixed a gramatical error in the Second VHDL tutorial
fixed issue where clicking the button would load from the wrong source.  The problem was due to the closer.  It would get a reference to an object that was outside of its scope and that reference can change value and it will be who ever the last one set it.

Solved it by saving the source path in the button object itself.  The calling this.file to retried the source.
Fixing typo in button
Merge pull request #52 from wh1pch81n/dh-49

DW-49 prog assn 1 button opens in new page