* changes to bfs instructions * added description on visual representation * Added to the animation description * Added information about stacks in the description * Edited description for clarity * Edited small details for grammar and clarity * Apply suggested wording and typo fixes Co-authored-by: Eric Leung <eric@erictleung.com> * Add typo fixes to BFS challenge Co-authored-by: Kyla Yujiri <27860923+kylayujiri@users.noreply.github.com> Co-authored-by: Eric Leung <eric@erictleung.com>