tpope/vim-surround — pull request #75 by byrongibson (2012-11-21 20:27:33+00:00)
Title: Added initial step in tutorial:  Hello World! -> "Hello World!"

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.