Update how it works documentation and interchange sponsor amount

[siddheshghadi751]

Update the How it Works Documentation with latest Proposal Metadata and Interchange sponsor amount

Acceptance Criteria :

• [x] Interchange sponsor amount
• [x] Add Teams, Authors Definition in Document.

[siddheshghadi751]

@srossross In the how it works documentation,

• committed metadata should be the amount proposal received.
• total metadata should be the total amount proposal required.

We have to change values in proposal metadata because committed amount entered is actually the total amount need to interchange it.