Revert "config: add bootstrap peers (#9680)" (backport #1109)

[mergify]

This is an automatic backport of pull request #1109 done by Mergify.
Cherry-pick of 2d3ee28 has failed:

On branch mergify/bp/v0.38.x/pr-1109
Your branch is up to date with 'origin/v0.38.x'.

You are currently cherry-picking commit 2d3ee28e8.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   cmd/cometbft/commands/run_node.go
	modified:   config/config.go
	modified:   node/node.go
	modified:   spec/p2p/legacy-docs/config.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   UPGRADING.md
	both modified:   config/toml.go
	both modified:   docs/core/configuration.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[cason]

This probably was introduced by mistake by a concurrent backport. Sticking to the name of the variable on line 316/311 below.