Github user jodersky commented on the issue:
https://github.com/apache/spark/pull/15513
More documentation is always great, thanks! Are the newlines at the
beginning of each expression intentional? E.g.
```
extended = """
Arguments:
class - a string literal ...
```
will have a newline before "Arguments". Also, keep in mind that the
indenting will be treated verbatim in triple quotes. Would it make sense to
call a `.stripMargin` before printing the extended usage string? That way it
would be possible to use pipes (|) to have a nice format in source code as well
as when it is printed to the user.
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