Minor clear color doc improvements (#19514)

Author: SpecificProtagonist

crates/bevy_render/src/camera/camera.rs

@@ -715,12 +715,13 @@ impl Camera {
     }
 }
 
-/// Control how this camera outputs once rendering is completed.
+/// Control how this [`Camera`] outputs once rendering is completed.
 #[derive(Debug, Clone, Copy)]
 pub enum CameraOutputMode {
     /// Writes the camera output to configured render target.
     Write {
         /// The blend state that will be used by the pipeline that writes the intermediate render textures to the final render target texture.
+        /// If not set, the output will be written as-is, ignoring `clear_color` and the existing data in the final render target texture.
         blend_state: Option<BlendState>,
         /// The clear color operation to perform on the final render target texture.
         clear_color: ClearColorConfig,

crates/bevy_render/src/camera/clear_color.rs

@@ -6,7 +6,9 @@ use bevy_reflect::prelude::*;
 use derive_more::derive::From;
 use serde::{Deserialize, Serialize};
 
-/// For a camera, specifies the color used to clear the viewport before rendering.
+/// For a camera, specifies the color used to clear the viewport
+/// [before rendering](crate::camera::Camera::clear_color)
+/// or when [writing to the final render target texture](crate::camera::Camera::output_mode).
 #[derive(Reflect, Serialize, Deserialize, Copy, Clone, Debug, Default, From)]
 #[reflect(Serialize, Deserialize, Default, Clone)]
 pub enum ClearColorConfig {
@@ -21,10 +23,15 @@ pub enum ClearColorConfig {
     None,
 }
 
-/// A [`Resource`] that stores the color that is used to clear the screen between frames.
+/// A [`Resource`] that stores the default color that cameras use to clear the screen between frames.
 ///
 /// This color appears as the "background" color for simple apps,
 /// when there are portions of the screen with nothing rendered.
+///
+/// Individual cameras may use [`Camera.clear_color`] to specify a different
+/// clear color or opt out of clearing their viewport.
+///
+/// [`Camera.clear_color`]: crate::camera::Camera::clear_color
 #[derive(Resource, Clone, Debug, Deref, DerefMut, ExtractResource, Reflect)]
 #[reflect(Resource, Default, Debug, Clone)]
 pub struct ClearColor(pub Color);