docs(tips): fix old revision to code snippet

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docs
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docs/tips_n_tricks.md
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<!-- find a way that we can still use this apart from in nixos config-->
for example, check out this line in our flake.nix:
-
https://github.com/soopyc/nix-on-koumakan/blob/3c32de4a69a5963f9cd83bf5cf0dccea88f9f36c/flake.nix#L22-L26
this avoids the horror of `import ../../../utils/bar.nix;`
···
<!-- find a way that we can still use this apart from in nixos config-->
for example, check out this line in our flake.nix:
+
https://github.com/soopyc/nix-on-koumakan/blob/8228dfc2c6e7aaa21b3f24f37699371837f25098/flake.nix#L22-L28
this avoids the horror of `import ../../../utils/bar.nix;`