fixed typos and examples in UPGRADE.md
fixed typos and examples in UPGRADE.md

stof/KnpMenuBundle,Soullivaneuh/KnpMenuBundle,bocharsky-bw/KnpMenuBundle,Soullivaneuh/KnpMenuBundle,piotrantosik/KnpMenuBundle,benji07/KnpMenuBundle,javiereguiluz/KnpMenuBundle,KnpLabs/KnpMenuBundle,WouterJ/KnpMenuBundle,Nek-/KnpMenuBundle