Fix manual. Added info about accessing values with comples keys from hash

[nataraj-hates-MS-for-stealing-github]

I found out that Variables manual, do not have info how to address hash element with complex key , like example.txt for example

This might cause real problem for Template Toolkit newbie. So I'd suggest a fix that adds another method of accessing hash value from hash to the Variables pod.

PS. Please refer me as Nikolay Shaplov (NATARAJ) in changelog, if you ever will refer me...