comments.md doesn't know about `//!`

[ErinCall]

The chapter on comments discusses two types of comments: // comments and /// doc comments. The section on testing mentions a third type: //! module doc comments. Should src/doc/trpl/comments.md be updated to include //!, or have I misunderstood something?

I'd be happy to help update the docs, but I thought I should make sure I know what's going on before I start telling everyone else :)

[bluss]

The reference lists all four (or six) syntaxes for doc comments. Maybe mentioning //! is a good idea for the book though.

[steveklabnik]

Yeah, I would not be opposed to describing //! in the comments section as well.

[ErinCall]

Thanks y'all! :)