Debounce function documentation

[carpben]

According to the documentation at http://underscorejs.org/docs/underscore.html#section-86 the debounce function:

Returns a function, that, as long as it continues to be invoked, will not be triggered.

I think this phrasing is a bit misleading, as the function that won't be triggered is the first parameter it recevies.

[jashkenas]

Want to send a PR that improves it, and get the credit for the change?

[carpben]

Yes I would, thanks. I'll post a suggestion later this week.

[jgonggrijp]

@carpben Friendly reminder that you are still welcome to submit a pull request and get the credit.

[carpben]

@jashkenas @jgonggrijp , Thanks for the patience, and sorry for the delay on my part.

I submitted #2858.

[jgonggrijp]

Was merged, closing.