JS nutshell: clarify variables section, clean up code examples

[Kaiepi]

The problem

I asked someone familiar with JS but not Perl 6 whether the JS nutshell page explained everything clearly or not. This was their response:

[16:05:53] #Zarel: Morfent, re: your Perl article, I don't recognize the term "dynamically scoped"
[16:05:59] #Zarel: you might want to explain that one

Solution provided

Don't use the term "dynamically scoped" and explain what dynamic variables are. Also clean up the code examples since a couple were wrong and console.log/say output wasn't preceded by OUTPUT: in all the examples.

[JJ]

Thanks!