docspack): mention re-install after source's default branch change #37560

Problem: `vim.pack.update()` doesn't update source's default branch if
  it has changed on the remote. It can be done by executing
  `git remote set-head origin --auto` for every plugin on every update,
  but it feels like too much extra work (which requires Internet
  connection) for a very rare use case.

  This matters since `version = nil` will keep pointing to previous
  default branch even after `vim.pack.update()`.

Solution: Document that in order for `version = nil` to point to the
  source's new default branch, perform clean re-install.

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