docs(element): Clean up return types for .each() and .then() (#3209)
docs(element): Clean up return types for .each() and .then() (#3209)

Fixes #3028
angular/protractor,onshape/protractor,NickTomlin/protractor,xaka/protractor,manoj9788/protractor,NickTomlin/protractor,Everworks/protractor,igniteram/protractor,jcapozzi/protractor,cnishina/protractor,fancyhejianyang/protractor-operation,angular/protractor,mgiambalvo/protractor,Everworks/protractor,xaka/protractor,xaka/protractor,fancyhejianyang/protractor-operation,igniteram/protractor,xaka/protractor,igniteram/protractor,marleitao/protractor,igniteram/protractor,mgiambalvo/protractor,sirwalt/protractor,marleitao/protractor,cnishina/protractor,onshape/protractor,cnishina/protractor,sirwalt/protractor,Everworks/protractor,jcapozzi/protractor,marleitao/protractor,angular/protractor,sirwalt/protractor,onshape/protractor,onshape/protractor,mgiambalvo/protractor,sirwalt/protractor,fancyhejianyang/protractor-operation,Everworks/protractor,NickTomlin/protractor,manoj9788/protractor,marleitao/protractor,manoj9788/protractor,jcapozzi/protractor,mgiambalvo/protractor,jcapozzi/protractor,manoj9788/protractor,NickTomlin/protractor,fancyhejianyang/protractor-operation,cnishina/protractor,angular/protractor