text: Title: [docs] Misleading reference to `ENVDIR` in the description of the `tox devenv` command
  Body: This paragraph https://tox.wiki/en/4.21.2/cli_interface.html#tox-devenv-(d) references a mysterious `ENVDIR` which seems to be copy-pasted from https://tox.wiki/en/4.21.2/cli_interface.html#tox-legacy-(le). The command example does not have a `ENVDIR` placeholder, but has a `[path]`. Is that what was supposed to be in the description?