Function implicit_description_from_attrs 

pub(crate) fn implicit_description_from_attrs(
    attrs: &[Attribute],
) -> Option<String>

Extract the implicit description from doc attributes (second paragraph).

In roxygen2, the first paragraph is the title and the second paragraph is the description. This function skips the first paragraph (up to the first blank line) and returns the second paragraph.

Returns None if there is no second paragraph, no doc comments, or if docs start with a @tag.