Add indents to match destination of code blocks

[pinin4fjords]

Example processes components in e.g. hello world have no indent:

"""
echo '$greeting' > output.txt
"""

This means that when users copy them across to indented process bodies, the indents don't match. Just to keep things super smooth, would be nice if they all had indents matching their destination:

    """
    echo '$greeting' > output.txt
    """