air formatting of binary operators + braced expressions is not covered by the guide

[MichaelChirico]

air prefers the following formatting of binary operators with multi-line RHS:

LHS %dopar%
  {
    styleFile(file, kPrefix, kWorkspace)
  }

However that basically contradicts the current guidance:

style/syntax.qmd

Line 368 in 2aed77e

Related code (e.g., an `if` clause, a function declaration, a trailing comma, ...) must be on the same line as the opening brace.

How can we square this circle? I'm trying to think through how to update lintr::brace_linter() to be air-compatible.

cc @DavisVaughan

[MichaelChirico]

An example of this in action where {purrr} applied this change:

https://github.com/tidyverse/purrr/pull/1192/changes#diff-695fea18b64adc96e72b6f4ffc8a84c53fa751c7689aa81048ab41182e9d14cb