Added short description comments for TokenScanner
Added short description comments for TokenScanner

* The description is taken from the README.md
* I looked up the basic rules for “documentation comments” for each language, in order to provide (minimal but functional) support for documentation generators

dirkrombauts/gherkin3,cucumber/gherkin3,chebizarro/gherkin3,pjlsergeant/gherkin,cucumber/gherkin3,pjlsergeant/gherkin,chebizarro/gherkin3,Zearin/gherkin3,chebizarro/gherkin3,chebizarro/gherkin3,cucumber/gherkin3,cucumber/gherkin3,dirkrombauts/gherkin3,Zearin/gherkin3,pjlsergeant/gherkin,SabotageAndi/gherkin,pjlsergeant/gherkin,Zearin/gherkin3,SabotageAndi/gherkin,pjlsergeant/gherkin,dirkrombauts/gherkin3,dirkrombauts/gherkin3,cucumber/gherkin3,Zearin/gherkin3,SabotageAndi/gherkin,Zearin/gherkin3,dirkrombauts/gherkin3,chebizarro/gherkin3,dirkrombauts/gherkin3,chebizarro/gherkin3,SabotageAndi/gherkin,SabotageAndi/gherkin,pjlsergeant/gherkin,chebizarro/gherkin3,pjlsergeant/gherkin,Zearin/gherkin3,dirkrombauts/gherkin3,pjlsergeant/gherkin,chebizarro/gherkin3,cucumber/gherkin3,pjlsergeant/gherkin,SabotageAndi/gherkin,cucumber/gherkin3,SabotageAndi/gherkin,SabotageAndi/gherkin,Zearin/gherkin3,cucumber/gherkin3,cucumber/gherkin3,SabotageAndi/gherkin,dirkrombauts/gherkin3,Zearin/gherkin3