[REEF-775] Fix typos in README.md of REEF-Wake
[REEF-775] Fix typos in README.md of REEF-Wake

JIRA:
  [REEF-775](https://issues.apache.org/jira/browse/REEF-775)

Pull Request:
   Closes #513

gyeongin/reef,shravanmn/reef,anupam128/reef,shulmanb/reef,yunseong/reef,jwang98052/incubator-reef,yunseong/incubator-reef,yingdachen/incubator-reef,singlis/reef,gyeongin/reef,apache/incubator-reef,gyeongin/reef,motus/reef,yingdachen/incubator-reef,dkm2110/veyor,markusweimer/incubator-reef,gyeongin/reef,dougmsft/reef,DifferentSC/incubator-reef,dongjoon-hyun/reef,motus/reef,anupam128/reef,afchung/incubator-reef,tcNickolas/reef,shravanmn/reef,tcNickolas/reef,dkm2110/veyor,dkm2110/veyor,dkm2110/veyor,afchung/incubator-reef,shravanmn/reef,jwang98052/incubator-reef,dkm2110/Microsoft-cisl,markusweimer/reef,yingdachen/incubator-reef,afchung/incubator-reef,dongjoon-hyun/incubator-reef,yunseong/reef,markusweimer/reef,jwang98052/incubator-reef,singlis/reef,jsjason/incubator-reef,yingdachen/incubator-reef,jsjason/incubator-reef,apache/incubator-reef,zerg-junior/incubator-reef,afchung/reef,yingdachen/incubator-reef,dafrista/incubator-reef,markusweimer/incubator-reef,dougmsft/reef,markusweimer/reef,tcNickolas/incubator-reef,gyeongin/reef,gyeongin/reef,jsjason/incubator-reef,yunseong/reef,jwang98052/reef,jwang98052/reef,yunseong/reef,yunseong/incubator-reef,yingdachen/incubator-reef,tcNickolas/reef,yunseong/incubator-reef,tcNickolas/reef,anupam128/reef,tcNickolas/incubator-reef,motus/reef,jwang98052/incubator-reef,tcNickolas/incubator-reef,zerg-junior/incubator-reef,dafrista/incubator-reef,dkm2110/veyor,singlis/reef,jwang98052/incubator-reef,nachocano/incubator-reef,markusweimer/incubator-reef,afchung/reef,afchung/incubator-reef,dkm2110/veyor,dkm2110/Microsoft-cisl,yingdachen/incubator-reef,dongjoon-hyun/incubator-reef,shulmanb/reef,dafrista/incubator-reef,jwang98052/reef,dafrista/incubator-reef,dougmsft/reef,DifferentSC/incubator-reef,shravanmn/reef,shravanmn/reef,dongjoon-hyun/reef,dougmsft/reef,dongjoon-hyun/reef,anupam128/reef,zerg-junior/incubator-reef,markusweimer/incubator-reef,markusweimer/incubator-reef,dougmsft/reef,nachocano/incubator-reef,nachocano/incubator-reef,jwang98052/incubator-reef,dafrista/incubator-reef,apache/reef,dongjoon-hyun/reef,motus/reef,afchung/reef,motus/reef,DifferentSC/incubator-reef,singlis/reef,dongjoon-hyun/incubator-reef,afchung/incubator-reef,dkm2110/Microsoft-cisl,dongjoon-hyun/reef,afchung/reef,DifferentSC/incubator-reef,dougmsft/reef,motus/reef,dkm2110/Microsoft-cisl,motus/reef,dongjoon-hyun/incubator-reef,tcNickolas/reef,dongjoon-hyun/incubator-reef,dongjoon-hyun/incubator-reef,apache/reef,shulmanb/reef,zerg-junior/incubator-reef,shravanmn/reef,jsjason/incubator-reef,apache/incubator-reef,markusweimer/incubator-reef,dafrista/incubator-reef,apache/reef,tcNickolas/incubator-reef,tcNickolas/incubator-reef,apache/reef,singlis/reef,DifferentSC/incubator-reef,markusweimer/reef,shulmanb/reef,zerg-junior/incubator-reef,tcNickolas/incubator-reef,tcNickolas/reef,afchung/reef,markusweimer/reef,markusweimer/reef,jwang98052/reef,apache/reef,jsjason/incubator-reef,nachocano/incubator-reef,jwang98052/reef,yunseong/incubator-reef,afchung/reef,dongjoon-hyun/reef,gyeongin/reef,afchung/incubator-reef,yunseong/reef,jwang98052/reef,dkm2110/veyor,jsjason/incubator-reef,shulmanb/reef,zerg-junior/incubator-reef,DifferentSC/incubator-reef,dongjoon-hyun/incubator-reef,jwang98052/incubator-reef,dafrista/incubator-reef,anupam128/reef,jsjason/incubator-reef,nachocano/incubator-reef,afchung/reef,apache/reef,shulmanb/reef,afchung/incubator-reef,singlis/reef,markusweimer/reef,nachocano/incubator-reef,markusweimer/incubator-reef,yunseong/incubator-reef,yunseong/incubator-reef,apache/incubator-reef,yunseong/reef,dougmsft/reef,DifferentSC/incubator-reef,apache/reef,apache/incubator-reef,tcNickolas/incubator-reef,tcNickolas/reef,apache/incubator-reef,zerg-junior/incubator-reef,yunseong/reef,anupam128/reef,singlis/reef,nachocano/incubator-reef,shravanmn/reef,apache/incubator-reef,dkm2110/Microsoft-cisl,shulmanb/reef,yunseong/incubator-reef,dkm2110/Microsoft-cisl,dkm2110/Microsoft-cisl,jwang98052/reef,dongjoon-hyun/reef,anupam128/reef