Thor, the generator USAGE files and some command USAGE files use
identation to divide the USAGE files into separate sections.
Indentation is also used to describe the options that can be passed
to the commands.

For consistency we should use the same formatting for all commands.
As Thor and most USAGE files already use identation it's a smaller
change to use identation for all commands.

For the examples extra identation is used. This makes them stand out
more allows removing the backticks which make it easier to copy the code
examples.

__Before (example for runner)__

```console
bin/rails runner --help
Commands:
  bin/rails runner [<'Some.ruby(code)'> | <filename.rb> | -]  # Run Ruby code in the context of your application
  bin/rails runner:help [COMMAND]                             # Describe available commands or one specific command

Options:
  -e, [--environment=ENVIRONMENT]  # The environment to run `runner` in (e.g. test / development / production).

Examples:

Run `puts Rails.env` after loading the app:

  bin/rails runner 'puts Rails.env'

Run the Ruby file located at `path/to/filename.rb` after loading the app:

  bin/rails runner path/to/filename.rb

Run the Ruby script read from stdin after loading the app:

  bin/rails runner -

You can also use the runner command as a shebang line for your executables:

  #!/usr/bin/env /path/to/weblog/bin/rails runner

  Product.all.each { |p| p.price *= 2 ; p.save! }
```

__After__

```console
bin/rails runner --help
Usage:
  bin/rails runner [<'Some.ruby(code)'> | <filename.rb> | -]

Options:
  -e, [--environment=ENVIRONMENT]  # The environment to run `runner` in (e.g. test / development / production).

Run Ruby code in the context of your application

Description:
    The Rails `runner` allows running Ruby code in the context of your application.

Examples:
    Run `puts Rails.env` after loading the app:

        bin/rails runner 'puts Rails.env'

    Run the Ruby file located at `path/to/filename.rb` after loading the app:

        bin/rails runner path/to/filename.rb

    Run the Ruby script read from stdin after loading the app:

        bin/rails runner -

    You can also use the runner command as a shebang line for your executables:

        #!/usr/bin/env /path/to/weblog/bin/rails runner
        Product.all.each { |p| p.price *= 2 ; p.save! }
```