Rubydoc missing curly brace characters

[lulalala]

I was reading through the documentation on Rubydoc:
https://www.rubydoc.info/gems/parser/Parser/Source/TreeRewriter

If you read the heading of "Multiple actions at the same end points:", it says:

The resulting string will be 'puts(=> [:everybody])'

The :hello is missing.

When I look at the github source code, the :hello is there: https://github.com/whitequark/parser/blob/master/lib/parser/source/tree_rewriter.rb#L46

It seems Rubydoc will remove things wrapped inside the curly brace {}.

Not sure how this can be mitigated though.