Merge pull request #23069 from lukego/R-packages-readme

r-modules/README.md: mention generate-shell.nix

authored by Domen Kožar and committed by GitHub a7dc9124 4ccb553b

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pkgs/development/r-modules/README.md
··· 87 87 ## Updating the package set 88 88 89 89 ```bash 90 + nix-shell generate-shell.nix 91 + 90 92 Rscript generate-r-packages.R cran > cran-packages.nix.new 91 93 mv cran-packages.nix.new cran-packages.nix 92 94