Update documentation/manual/Highlights.md
Update documentation/manual/Highlights.md

Corrected some typos. Signed the CLA.
marcospereira/playframework,ktoso/playframework,aradchykov/playframework,rajeshpg/playframework,zaneli/playframework,wegtam/playframework,wegtam/playframework,aradchykov/playframework,mkurz/playframework,Shruti9520/playframework,aradchykov/playframework,ktoso/playframework,mkurz/playframework,hagl/playframework,marcospereira/playframework,wegtam/playframework,ktoso/playframework,richdougherty/playframework,zaneli/playframework,marcospereira/playframework,wegtam/playframework,Shenker93/playframework,hagl/playframework,richdougherty/playframework,ktoso/playframework,Shruti9520/playframework,mkurz/playframework,richdougherty/playframework,hagl/playframework,marcospereira/playframework,Shenker93/playframework,benmccann/playframework,wsargent/playframework,benmccann/playframework,benmccann/playframework,playframework/playframework,mkurz/playframework,benmccann/playframework,hagl/playframework,zaneli/playframework,playframework/playframework,aradchykov/playframework,Shenker93/playframework,Shruti9520/playframework,wsargent/playframework,richdougherty/playframework,Shruti9520/playframework,wsargent/playframework,zaneli/playframework,rajeshpg/playframework,wsargent/playframework,rajeshpg/playframework,playframework/playframework,Shenker93/playframework,rajeshpg/playframework