Radheem/quant 564 fix firefly python client documentation

[radheem]

Description

This PR smooths the user onboarding process by improving examples and comments.

Change Log

1. Simplified the main event loop
2. Orderbook updates were used to illustrate socket connection in most examples. Since most users test on the Testnet and Testnet Orderbooks don’t update frequently, the user won’t always get events, and the example will not be able to illustrate the flow successfully. Hence moved all socket illustrations to exchange health events
3. Replaced code snippets in readme with complete functioning examples.
4. The Sockets.open() function call Sockets._establish_connection() function, then checks if the connection was established; if it failed to create a connection it then calls Sockets.close(), which is an async function, but this call had no await so added await.
5. removed unnecessary semicolons

LINKS

QUANT-564

[yasir7ca]

Good job