Add further clarification on Comment Post requirement on App Design

[saimatsumoto]

Type of Change

• [ ] New Documentation
• [x] Update to existing documentation
• [ ] Other (please clarify below)

Summary

Need to update how commenting on blog post works:

1. Comment display requirement to be confirmed.
2. Name, Email option, etc.
3. Update wireframe / image

[saimatsumoto]

App Design requirement updated, will track (3.) image updated on #35 .

Please let me know if there are missing requirements @thescientist13