Fix author error

docs/Airbrush/Airbrush.mdx

@@ -16,8 +16,8 @@ If you've learned the previous chapter, rendering an airbrush is nothing more th
 ![toairbrush0](to-air0.gif)
 ![toairbrush1](to-air1.gif)
 
-When artists draw illustrations or animations, airbrush has special uses.
-It is commonly used for coloring, shading, or highlighting, while other brushes are typically used for drawing outlines.
+When artists draw illustrations or animations, airbrush has special usages like coloring, shading, or highlighting an illustration,
+while other brushes are typically used for drawing outlines.
 
 ![shade](shade-highlight.gif)
 
@@ -70,7 +70,7 @@ But the dot is transparent, and we need to know the alpha value associated with
 
 ## Special Alpha Density
 To get a clearer comprehension of the theory, let's examine a special case.
-Consider the alpha density value to be a point with a constant value,
+Consider the alpha density value is a constant,
 indicating that a stamp stroke's footprint is a consistently transparent dot, defined by the function
 $$
 \alpha_s(d) =

docs/Introduction/Introduction.mdx

@@ -36,7 +36,8 @@ When hovering your mouse on the canvas you can:
 This tutorial series will teach you how to use the modern GPU graphics pipeline to render brush strokes,
 commonly seen with a paint tool in graphics design software like Photoshop.
 The contents mainly come from my research work [Ciallo: The next generation vector paint program][Ciallo],
-and a textbook "Image and Video-Based Artistic Stylisation" by Stephen DiVerdi, which introduce brush stroke rendering in its second chapter.
+and a textbook "Image and Video-Based Artistic Stylisation" edited by Paul Rosin, John Collomosse.
+The book introduces brush stroke rendering in its second chapter, authored by Stephen DiVerdi.
 Since there will be more research work on GPU brush stroke rendering,
 I will continuously update this tutorial series to teach you related techniques in (potentially) influential research works.