Added initial step in tutorial: Hello World! -> "Hello World!" (update)

[byrongibson]

It wasn't clear to me how to get from un-surrounded text to surrounded text and this step was missing in tutorial. Thx to ChrisJohnson and graywh for answering, added method as first step in tutorial.

[tpope]

This is covered down below, no? csw is a wierd special case of ysiw so I certainly don't want to lead with it.