minor grammar fixes
minor grammar fixes

Also, the expression is commonly written as [all of a sudden](http://grammarist.com/usage/all-of-a-sudden-or-all-of-the-sudden/).
ternus/click,gambogi/click,scalp42/click,pallets/click,lucius-feng/click,MakerDAO/click,her0e1c1/click,hackebrot/click,dastergon/click,khwilson/click,polinom/click,Akasurde/click,GeoffColburn/click,willingc/click,andela-ooladayo/click,pgkelley4/click,hugopeixoto/click,mitsuhiko/click,hellodk/click,ma-ric/click,TomRegan/click,jvrsantacruz/click,amjith/click,naoyat/click,Nudies/click,pombredanne/click,cbandera/click,glorizen/click