Fix typo in the user guide about Task Updates
Fix typo in the user guide about Task Updates

Testing Done:
Fix a minor typo in the user guide and add a missing "and"

Reviewed at https://reviews.apache.org/r/42321/

crashlytics/aurora,protochron/aurora,apache/aurora,apache/aurora,rdelval/aurora,protochron/aurora,thinker0/aurora,medallia/aurora,thinker0/aurora,medallia/aurora,crashlytics/aurora,apache/aurora,rdelval/aurora,medallia/aurora,medallia/aurora,apache/aurora,crashlytics/aurora,rdelval/aurora,thinker0/aurora,crashlytics/aurora,medallia/aurora,rdelval/aurora,crashlytics/aurora,crashlytics/aurora,medallia/aurora,thinker0/aurora,apache/aurora,thinker0/aurora,apache/aurora,rdelval/aurora,rdelval/aurora,protochron/aurora,protochron/aurora,thinker0/aurora,protochron/aurora,protochron/aurora