Wilken Rivera 0e2a3e1058 command/hcl2_upgrade: Update description text for command
Before change
```
Usage: packer [--version] [--help] <command> [<args>]

Available commands are:
    build           build image(s) from template
    console         creates a console for testing variable interpolation
    fix             fixes templates from old versions of packer
    hcl2_upgrade    build image(s) from template
    inspect         see components of a template
    validate        check that a template is valid
    version         Prints the Packer version
```

After change
```
Usage: packer [--version] [--help] <command> [<args>]

Available commands are:
    build           build image(s) from template
    console         creates a console for testing variable interpolation
    fix             fixes templates from old versions of packer
    hcl2_upgrade    transform a JSON template into a HCL2 configuration
    inspect         see components of a template
    validate        check that a template is valid
    version         Prints the Packer version

```
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