doc: changes in Introduction section of actors_privileges_deployments.md

[theothercrowd]

changes in docs

Here's the updated version of Introduction section of actors_privileges_deployments.md:

“This document provides a comprehensive overview of the actors involved in the smart contract system and outlines their respective privileges and roles. Different roles (we call them domains) are granted via the AddressManager contract’s setAddress() function. The idea is very similar to Optimism’s AddressManager, except that we use the chainId + domainName as the key for a given address. We need to do so because, for bridging purposes, the destination chain’s bridge address needs to be included to signal that the message hash is tamper-proof. Every contract which needs some role-based authentication needs to inherit from the AddressResolver contract. This will serve as a ‘middleman/lookup’ by querying the AddressManager to determine if a given address is allowed to act on behalf of that domain or not.”

Changes made:

“domain” to “domains”

“Idea is very similar Optimism’s AddressManager” to “The idea is very similar to Optimism’s AddressManager”

Added “to” in “we need to do so”

“signaling the message hash is tamper-proof” to “to signal that the message hash is tamper-proof” -- with this phrase I'm not quite sure what you wanted to say, but I tried my best to edit that.

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