Feat: WIP terse code documentation

crates/ratatui/src/lissajous.rs

@@ -1,3 +1,5 @@
+//! Lissajous XY oscilloscope widget using braille characters.
+
 use crate::theme;
 use ratatui::buffer::Buffer;
 use ratatui::layout::Rect;
@@ -9,6 +11,7 @@ thread_local! {
     static PATTERNS: RefCell<Vec<u8>> = const { RefCell::new(Vec::new()) };
 }
 
+/// XY oscilloscope plotting left vs right channels as a Lissajous curve.
 pub struct Lissajous<'a> {
     left: &'a [f32],
     right: &'a [f32],