Add Breaking changes section to SG cookbook (#47336)

* Add Breaking changes section to SG cookbook

docs/features/source-generators.cookbook.md

@@ -857,6 +857,32 @@ specialized exactly to what was written in the user class.
 
 TODO:
 
+## Breaking Changes:
+
+Between preview and release the following breaking changes were introduced:
+
+**Rename `SourceGeneratorContext` to `GeneratorExecutionContext`**  
+**Rename `IntializationContext` to `GeneratorInitializationContext`**
+
+This affects user-authored generators, as it means the base interface has changed to:
+
+```csharp
+public interface ISourceGenerator
+{
+    void Initialize(GeneratorInitializationContext context);
+    void Execute(GeneratorExecutionContext context);
+}
+```
+
+The required action from the user is to rename the parameter types of the `Initialize` and `Execute` methods to match.
+
+**Rename `RunFullGeneration` to `RunGeneratorsAndUpdateCompilation`**  
+**Add `Create()` static methods to `CSharpGeneratorDriver` and obsolete the constructor.**
+
+This affects any generator authors who have written unit tests using the `CSharpGeneratorDriver`. To create a new instance
+of the generator driver, the user should no longer call `new` but use one of the `CSharpGeneratorDriver.Create()` overloads.
+The user should no longer use the `RunFullGeneration` method, and instead call `RunGeneratorsAndUpdateCompilation` with the same arguments.
+
 ## Open Issues
 
 This section track other miscellaneous TODO items:
@@ -870,4 +896,4 @@ This section track other miscellaneous TODO items:
 - Control of name. The developer can control the name of the member
 - Generation is optional/depending on other state. Based on other information, generator might decide that the method isn't needed.
 
-**Feature detection**: Show how to create a generator that relies on specific target framework features, without depending on the TargetFramework property.
+**Feature detection**: Show how to create a generator that relies on specific target framework features, without depending on the TargetFramework property.