top level domains in fake contracts

[jurij-jukic]

when we add more TLDs to fake contracts, update the following text, @bitful-pannul

kinode-book/src/my_first_app/chapter_1.md

Lines 236 to 237 in 6b8040b

	Note that your node will be named `fake.dev`, as opposed to `fake.os`.
	The `.dev` suffix is used for development nodes.