docs/contributing: fix "ha256" -> "sha256" typo

+1 -1
+1 -1
doc/contributing/coding-conventions.chapter.md
··· 456 owner = "NixOS"; 457 repo = "nix"; 458 rev = "1f795f9f44607cc5bec70d1300150bfefcef2aae"; 459 - hash = "ha256-7D4m+saJjbSFP5hOwpQq2FGR2rr+psQMTcyb1ZvtXsQ="; 460 } 461 ``` 462
··· 456 owner = "NixOS"; 457 repo = "nix"; 458 rev = "1f795f9f44607cc5bec70d1300150bfefcef2aae"; 459 + hash = "sha256-7D4m+saJjbSFP5hOwpQq2FGR2rr+psQMTcyb1ZvtXsQ="; 460 } 461 ``` 462