Add docs for operator : multicasting - publish

[ashwin-sureshkumar]

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Add docs for operator publish under group multicasting

Below is minimum details needed

• [ ] name
• [ ] operatorType
• [ ] signature
• [ ] parameters
• [ ] short description
• [ ] Technical description
• [ ] Visual example (Marble diagram)
• [ ] Real world example (Non-framework)
• [ ] Related Operators

[Dorus]

Import information to include in the publish docs:

publish has 2 variants. 1 publish() that returns a ConnectableObservable where you can call connect() or refCount()on. 2 publish(selector) that returns a normal Observable and will only multicast inside the selector.

Where the first variant returns an hot observable, the second variant returns a cold one.

[ladyleet]

Thx @dorus!