Write missing docs and reenable deny statements

wgpu/src/defaults.rs

@@ -1,7 +1,10 @@
+//! Use default styling attributes to inherit styles.
 use iced_native::Color;
 
+/// Some default styling attributes.
 #[derive(Debug, Clone, Copy)]
 pub struct Defaults {
+    /// Text styling
     pub text: Text,
 }
 
@@ -13,8 +16,10 @@ impl Default for Defaults {
     }
 }
 
+/// Some default text styling attributes.
 #[derive(Debug, Clone, Copy)]
 pub struct Text {
+    /// The default color of text
     pub color: Color,
 }