Formatter bug re: multiline calls with heredoc argument

[Sija]

It seems I've found a bug in the current formatter (Crystal v1.20.2):

foo(
  <<-HEREDOC,
    foo
    HEREDOC
)

foo[
  <<-HEREDOC,
    foo
    HEREDOC
]

gets formatted to:

foo(
  <<-HEREDOC
    foo
    HEREDOC
,
)

foo[
  <<-HEREDOC,
    foo
    HEREDOC

]

The same happens for a named argument as well.

Originally posted by @Sija in #17018 (comment)