doc: update accept selection configuration example
doc: update accept selection configuration example

Incorporate what I learned from:

https://github.com/wincent/wincent/commit/8a95c3dba72616e03e62b2ffaabbea83392f983c

And add a link to a more complete example.

yrro/command-t,simichaels/dotfiles,wincent/command-t,besarthoxhaj/command-t,lencioni/command-t,1234-/command-t,besarthoxhaj/command-t,supriyantomaftuh/command-t,lencioni/command-t,mtimkovich/command-t,vrkansagara/command-t,supriyantomaftuh/command-t,1234-/command-t,wincent/command-t,wincent/command-t,mtimkovich/command-t,vrkansagara/command-t,yrro/command-t,simichaels/dotfiles