Fix YARD doc for Options

[Matt]

Issue description

In #1489, we changed the definition of Options (Structs) from Env < Options.new to Env = Options.new { }.
This makes our Options structs compatible with Sorbet, but it breaks their YARD auto-generate docs.
See the PR thread for more details.

[Olle Jonsson]

Good trade-off!
Let us see if it is possible to get both!