Update 20486C_MOD07_DEMO.md
Update 20486C_MOD07_DEMO.md

resolving bugs# 84529, 84531, 84532, 84533, 84534
MicrosoftLearning/20486-DevelopingASPNETMVCWebApplications,MicrosoftLearning/20486-DevelopingASPNETMVCWebApplications,MicrosoftLearning/20486-DevelopingASPNETMVCWebApplications