remove doc about basePath being optional.
remove doc about basePath being optional.

zeornelas/jsdoc-express-with-swagger,fliptoo/swagger-express,aiguofer/swagger-express,zeornelas/jsdoc-express-with-swagger,devlouisc/jsdoc-express-with-swagger,aiguofer/swagger-express,cyner/swagger-koa,devlouisc/jsdoc-express-with-swagger,ryanwilliamquinn/swagger-sails,vellotis/swagger-restify,yourdelivery/swagger-restify,drGrove/swagger-jsdoc,fliptoo/swagger-express,bonnlei/koa-swagger2,cyner/swagger-koa,theBoEffect/tbe-swagger2-express,ryanwilliamquinn/swagger-sails,Surnet/swagger-jsdoc