Update docs on transform package.json config opts

[gmaclennan]

The syntax for configuring transforms and passing sub arguments is not obvious. It took me a good 30 mins of hunting around to understand that to do this:

browserify index.js -t [ mytransform --foo bar --qux]

I need to do this:

"browserify": {
  "transform": [
    ["mytransform", { "foo": "bar", "qux": true }]
  ]
}