doc: Update reference to post-process effects (#2336)

docs/api-reference/shadertools/shader-passes/image-processing.mdx

@@ -1,6 +1,6 @@
 # Image Processing
 
-Screen space effects packaged as reusable shader modules in `@luma.gl/shadertools` based on the [glfx library](http://evanw.github.io/glfx.js/).
+Screen space effects packaged as reusable shader modules in `@luma.gl/effects` based on the [glfx library](http://evanw.github.io/glfx.js/).
 
 :::caution
 > luma.gl shader modules can be used directly with [deck.gl](https://deck.gl)'s post processing system.
@@ -13,10 +13,10 @@ Most of these image post processing effects (and this documentation page) are fo
 
 ## Usage
 
-Import the shader module(s) you would like to use from `@luma.gl/shadertools`, e.g:
+Import the shader module(s) you would like to use from `@luma.gl/effects`, e.g:
 
 ```typescript
-import {brightnessContrast} from '@luma.gl/shadertools';
+import {brightnessContrast} from '@luma.gl/effects';
 ```
 
 ## Shader Modules

docs/upgrade-guide.md

@@ -86,6 +86,10 @@ v9.1 continues to build out WebGPU support. Some additional deprecations and bre
 | `getDependencyGraph()`               | Removed | `getShaderModuleDependencies(module)` . | Interact directly with the shader module           |
 | `glsl` template string               | Removed | `/* glsl */` comment                    | Enable syntax highlighting in vscode using comment |
 
+**@luma.gl/effects**
+
+New module. All postprocessing effects that were previously in `@luma.gl/shadertools` are now exported from `@luma.gl/effects`.
+
 **@luma.gl/webgl**
 
 - `WebGLDeviceContext` - Note that luma.gl v9.1 and onwards set `DeviceProps.webgl.preserveDrawingBuffers` to `true` by default. This can be disabled for some (potential) memory savings and a (potential) minor performance boost on resource limited devices, such as mobile phones, at the cost of not being able to take screenshots or rendering to the screen without clearing it.