Update docs/tutorial-for-unity.md

Co-authored-by: jdrueckert <[email protected]>

docs/tutorial-for-unity.md

@@ -19,7 +19,7 @@ a node has Inputs and Outputs, it's input are result from previous node, and it'
 For example, a highPass node uses `_SceneColor` as input, then a bloom node uses both `_SceneColor` and the highpass node's output as input.
 
 The Unity equivalent of `_SceneColor` is the scene texture.
-highpass node is a node to grab light area then send to blur node to make the bright area of bloom.
+The highpass node is used to grab a light area and send it to the blur node to achieve the bright area of a bloom effect.
 it's being used for **InitialPostProcessingNode** as input for final FBO which is the final output of the camera.
 
 ## How to create a FBO