add command_line scope to help metavar (#42890)
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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		| @@ -107,7 +107,7 @@ | |||||||
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| #: metavar to use for commands that accept scopes | #: metavar to use for commands that accept scopes | ||||||
| #: this is shorter and more readable than listing all choices | #: this is shorter and more readable than listing all choices | ||||||
| SCOPES_METAVAR = "{defaults,system,site,user}[/PLATFORM] or env:ENVIRONMENT" | SCOPES_METAVAR = "{defaults,system,site,user,command_line}[/PLATFORM] or env:ENVIRONMENT" | ||||||
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| #: Base name for the (internal) overrides scope. | #: Base name for the (internal) overrides scope. | ||||||
| _OVERRIDES_BASE_NAME = "overrides-" | _OVERRIDES_BASE_NAME = "overrides-" | ||||||
|   | |||||||
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	 Danny McClanahan
					Danny McClanahan