Extended the intro to include more information on how data is transferred, the benefits, and also some pitfalls.
Merge branch 'develop' into docs_update_data_addon
Copy edited and updated a section based on engineer feedback.
Merge pull request #1169 from zhouyaoji/docs_update_data_addon

[docs] Updated the section on using the Data addon, giving more context about how data is passed over the wire from the server to the client and highlighting the benefits/pitfalls.