Updates grammer for srcset question
Updates grammer for srcset question

* Makes it a bit more obvious what attribute we're talking about.
* Ask for an explanation on how a browser evaluates the attribute
crenaz/Front-end-Developer-Interview-Questions,h5bp/Front-end-Developer-Interview-Questions,chintan9/Front-end-Developer-Interview-Questions,chintan9/Front-end-Developer-Interview-Questions