fix(docs): correct the method name of notification provider

[clement-lta]

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Bugs / Features

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What is the current behavior?

At the top of the notification provider in docs. we said that a notificationProvider must include following methods:

const notificationProvider = {
  show: () => {},
  close: () => {},
};

but in the codebase, we have open instead of show

What is the new behavior?

Change to correct method name from show -> open

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Latest commit: 0764b49

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