Default to "Align operands of pipe operator" setting does not produce expected results.

[MalmarPadecain]

Describe the bug
The default to "Align operands of pipe operator" setting does not format @type the way this style guide recomends and mix format creates.
Unchecking this option results in the expected behaviour.

To Reproduce
Steps to reproduce the behavior:

1. Create a multiline typespec
2. Run formater

@type a ::
        :a
        | :b
        | :c
          | :d
          | :e
            | :f 

or

@type a :: :a |
           :b |
           :c |
           :d |
           :e |
           :f

Expected behavior

@type a ::
        :a
        | :b
        | :c
        | :d
        | :e
        | :f 

Desktop:

• OS: Debian
• Version 10

Erlang:

• Version 23

Elixir:

• Version 1.10.3

Plugin:

• Version 11.7.0