doc/vim: fix instructions on vim-plugins-updater update (#438307)

Changed files
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doc
languages-frameworks
+7 -2
doc/languages-frameworks/vim.section.md
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nix-shell -p vimPluginsUpdater --run 'vim-plugins-updater --proc 1'
```
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If you want to update only certain plugins, you can specify them after the `update` command. Note that you must use the same plugin names as the `pkgs/applications/editors/vim/plugins/vim-plugin-names` file.
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To update only specific plugins, list them after the `update` command:
```sh
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nix-shell -p vimPluginsUpdater --run 'vim-plugins-updater update "nvim-treesitter" "LazyVim"'
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nix-shell -p vimPluginsUpdater --run 'vim-plugins-updater update "nvim-treesitter" "mini.nvim" "mini-nvim"'
```
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The updater script accepts plugin arguments in different formats:
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- `"mini.nvim"` := The GitHub repository name, the raw plugin name, or the alias defined in `vim-plugin-names`.
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- `"mini-nvim"` := The normalized plugin name, which matches the attribute name generated in `generated.nix`
## How to maintain an out-of-tree overlay of vim plugins? {#vim-out-of-tree-overlays}