Strangely, I don't see a need for a search box for the command reference.
The Front page of the command reference has an alphabetic index to choose from, so if you want to see details of say, the deleteVehicle command, you would click on 'D'.
Once on the 'D' page there is an index of commands on the left of the page, clicking on deleteVehicle takes you straight to the command you wanted.
Simple
In the time it takes you to enter a command into a search box and press go, you could already have written the book on the subject.
Planck