[Fix] How to Contribute to Appflowy

[JRS296]

Regarding few requested changes that need to be fixed:

• [x] Title Case - use: https://capitalizemytitle.com/
• [x] Line 47, shorten it
• [x] Line 123, shorten it
• [x] Line 78
• [x] Line 149
• [x] General tone improvement + making text more concise where required
• [x] General Grammar check
• [ ] Improving image resolution on Appflowy Docs?

[JRS296]

@annieappflowy I can add these changes in a seperate PR. However if the editor will be taking care of it all, I'll close this issue 👍

[annieappflowy]

Please do before I bring in our editor. Thanks