Nativescript-cli: [Documentation] Remove deprecated plugin commands from nativescript help

[endarova]

CLI 4.2.2
If you execute: tns plugin -h , you can see ‘find’ and ‘search’ listed as available commands. Since they are no more available they should be removed from help and docs.

[dcarrot2]

@endarova Happy to take this one on if it's still available!