Improve documentation of sync methods #540
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Just like in core Node.js modules, synchronous methods should mostly be avoided, except in specific situations where they are necessary. This PR improves their documentation based on this.
First, it moves them down in the readme and group them together. This reduces the amount of things to learn for users: they can just focus on the differences on the 4 main invocation methods, and then, as a follow-up, learn that synchronous methods for them exist as well.
Second, their description in both the readme and the type tests were a little out-of-sync. This updates them.