Fix search code example

[jrdnull]

Also renamed bloodhound -> engine to match other examples

[jrdnull]

Ah, sorry... should have checked first, there are already at least two PRs for this. I'll leave this open though as it also renames bloodhound to engine to be consistent with the other examples.

See #1563

[dt1973]

@jrdnull Hi! I don't get it, isn't this an abandoned repo? What about https://github.com/corejavascript/typeahead.js?

[jrdnull]

Yes, looks that way. I switched to the corejavasript fork which includes a fix for rendering all results when there are less than the limit.

I created this when reading the docs through the web editor before I realised it was abandoned.
Thanks for pointing out the most active fork 👍