Update releasenotes.md

No where in documentation you can find that Product and Package have been merged. By adding this to the release notes at least a developer can find it this way.

I had to ask a question about it to be sure...: https://stackoverflow.com/questions/76621867/wix-v3-to-wix-v4-no-product-tag-anymore/76623039

src/Docusaurus/docs/releasenotes.md

@@ -47,7 +47,7 @@ All of the goodness in WiX v4.0.0 and v4.0.1 remains.
 - Building patches is much easier (one command!) and can use MSI packages as the source of target and updated files.
 - The WiX extensibility model and pipeline integration has been dramatically enhanced.
 - The WiX language has been further simplified. For example:
-  - [The `Package` element](./schema/wxs/package.md) combines what was two elements in WiX v3.
+  - [The `Package` element](./schema/wxs/package.md) combines what was two elements (`Product` and `Package`) in WiX v3 .
   - The [`StandardDirectory` element](./schema/wxs/standarddirectory.md) simplifies the use of standard Windows Installer directories.
   - The `Subdirectory` attribute on, for example, [the `Component` element](./schema/wxs/component.md), lets you create subdirectories without nested [`Directory` elements](./schema/wxs/directory.md).
   - WiX supplies a default [`MediaTemplate` element](./schema/wxs/mediatemplate.md) if you don't specify one in your authoring.