303a0b3653
It's now possible to add config on the command line with `spack -c <CONFIG_VARS> ...`, but the new `command_line` scope isn't reflected in the help output for `--scope`:
```bash
> spack help config
...
--scope {defaults,system,site,user}[/PLATFORM] or env:ENVIRONMENT
configuration scope to read/modify
...
```
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| .. | ||
| docs | ||
| env | ||
| external | ||
| llnl | ||
| spack | ||
| spack_installable | ||