change newline to emtpy line

This updates make the use of `empty line` more consistent.  In my mind, `newline` means a single carriage return whereas `empty line` means double carriage return so that you create an empty line between the previous code and the new code.

A newline after the first line:

```
first line
second line
```

An empty line after the first line:

```
first line

second line
```