Clarify that Rubies are auto-detected when chruby.sh is first loaded.
Clarify that Rubies are auto-detected when chruby.sh is first loaded.

ngpestelos/chruby,eunomie/chgo,ilikepi/chruby,kbrock/chruby,ilikepi/chruby,kbrock/chruby,ngpestelos/chruby,postmodern/chruby,eunomie/chgo,regularfry/chruby,postmodern/chruby,regularfry/chruby