Function render_yard_sections 

pub fn render_yard_sections(sections: &RustdocSections) -> String

Render RustdocSections as YARD documentation comment body.

• # Arguments → @param name desc (one per arg)
• # Returns → @return desc
• # Errors → @raise desc
• # Example → @example block.

Output is a plain string with \n separators; the emitter wraps each line in # itself.