docs(installation): wrap vim.pack.add args in a list

[junjiexh]

Description

vim.pack.add expects a list of specs, but the current installation snippet passes bare strings / a single spec table. All three vim.pack.add calls in the snippet trigger the same error on Neovim 0.12:

vim/pack.lua: specs: expected list, got string/table

Before:

vim.pack.add("https://www.github.com/nvim-lua/plenary.nvim")
vim.pack.add("https://github.com/nvim-treesitter/nvim-treesitter")
vim.pack.add({
  src = "https://www.github.com/olimorris/codecompanion.nvim",
  version = vim.version.range("^19.0.0")
})

After — each arg is wrapped in an outer list so the snippet works as copy-pasted:

vim.pack.add({ "https://www.github.com/nvim-lua/plenary.nvim" })
vim.pack.add({ "https://github.com/nvim-treesitter/nvim-treesitter" })
vim.pack.add({ {
  src = "https://www.github.com/olimorris/codecompanion.nvim",
  version = vim.version.range("^19.0.0")
} })

AI Usage

Used Claude Code to spot the mismatch after hitting the runtime error locally and to draft this description.

Related Issue(s)

N/A

Screenshots

N/A

Checklist

• I've read the contributing guidelines and have adhered to them in this PR
• I confirm that this PR has been majority created by me, and not AI (unless stated in the "AI Usage" section above)
• I've run `make all` to ensure docs are generated, tests pass and StyLua has formatted the code
• (optional) I've added test coverage for this fix/feature
• (optional) I've updated the README and/or relevant docs pages

[olimorris]

Great catch. Can you run make all so the vimdocs are updated too?

[junjiexh]

Great catch. Can you run make all so the vimdocs are updated too?

Done. Thanks for the reminder