updates the displayed keyboard shortcut help text

@bendk  - can you check this for #783,  it's not perfect, but it's better than completely wrong until we get to #780
![screen shot 2013-09-19 at 1 00 37 pm](https://f.cloud.github.com/assets/299270/1172236/c57ddbc4-211b-11e3-95eb-ee0d0cf75463.png)