improve format

dev-docs/RFCs/v7.x/shadow-for-directional-lights.md

@@ -11,7 +11,7 @@ Deck.gl has new basic lighting effect since 7.0, having shadow effects for direc
 
 ## Proposal
 ### API
-`LightWithShadowEffect` class is the public interface to create shadow effects, it extends from LightingEffect and has one param.
+`LightWithShadowEffect` class is the public interface to create shadow effects, it extends from `LightingEffect` and has one param.
 * `lights`(Object): collection of light sources
 
 New layer prop
@@ -36,26 +36,33 @@ const dirLight1 = new DirectionalLight({
   direction: [-10, -20, -30]
 });
 
-const lightWithShadowEffect = new LightWithShadowEffect({ambientLight, dirLight0, dirLight1});
+const lightWithShadowEffect = new LightWithShadowEffect({
+  ambientLight,
+  dirLight0,
+  dirLight1
+});
 const deckgl = new Deck({
   canvas: 'my-deck-canvas',
   effects: [lightWithShadowEffect],
   layers: [
-      // building layer
-      new SolidPolygonLayer({
+    // building layer
+    new SolidPolygonLayer({
       enableShadow: true,
-      ...}),
-      // ground layer
-      new SolidPolygonLayer({
+      ...
+    }),
+    // ground layer
+    new SolidPolygonLayer({
       enableShadow: true,
-      ...})]
+      ...
+    })
+  ]
 });
 ```
 ### Workflow
-* User creates LightWithShadowEffect which adds shadow modules into default shader modules
-* LightWithShadowEffect is passed into deck and create shadow passes based on light directions, there is one shadow pass for each directional light, for now totally two lights are supported
+* User creates `LightWithShadowEffect` instance which adds shadow modules into default shader modules
+* `LightWithShadowEffect` instance is passed into deck and create shadow passes based on light directions, there is one shadow pass for each directional light, for now totally two lights are supported
 * For each shadow pass, layers are rendered to a shadow map
 * After all the effects are processed, there is a regular layer rendering pass, shadow maps are used to render the final shadows.
 
 ## Limitations
-With the current design, the user needs to create LightWithShadowEffect before Deck's initialization, so that the default modules can be modified before layer shaders are assembled.
+With the current design, the user needs to create `LightWithShadowEffect` instance before Deck's initialization, so that the default modules can be modified before layer shaders are assembled.