Monorepo for Tangled

docs: document registry url syntax

Signed-off-by: oppiliappan <me@oppi.li>

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docs/DOCS.md
··· 680 680 dependencies from, and the value being the list of 681 681 dependencies to fetch. 682 682 683 + The registry URL syntax can be found [on the nix 684 + manual](https://nix.dev/manual/nix/2.18/command-ref/new-cli/nix3-registry-add). 685 + 683 686 Say you want to fetch Node.js and Go from `nixpkgs`, and a 684 687 package called `my_pkg` you've made from your own registry 685 688 at your repository at