Add documentation to note there are extension changes for oopbas

Also add a note that building bundles using wix.exe requires updating to the new
`WixToolset.BootstrapperApplications.wixext`.

Fixes wixtoolset/issues#8155

Author: robmen

src/Docusaurus/docs/fivefour/index.md

@@ -199,3 +199,5 @@ For more information, see the [_Default feature_ WIP](https://github.com/wixtool
 - WixToolset.Firewall.wixext now supports the capabilities of the modern Windows Firewall. See [the documentation](../schema/firewall/firewallexception.md) for all the new goodness. Thanks to [@chrisbednarski](https://github.com/chrisbednarski) for all [the work](https://github.com/wixtoolset/wix/pulls?q=is%3Apr+author%3Achrisbednarski).
 - WixToolset.Netfx.wixext's [DotNetCompatibilityCheck](../schema/netfx/dotnetcompatibilitycheck.md) now sets the specified property to 13 when the requested platform is not compatible with the platform the installer is running on. Thanks to [@apacker1](https://github.com/apacker1) for the [pull request](https://github.com/wixtoolset/wix/pull/459).
 - WixToolset.Util.wixext now has the following `_NODOMAIN` properties from [WixQueryOsWellKnownSID](../tools/wixext/wininfo.md#querywindowswellknownsids): `WIX_ACCOUNT_ADMINISTRATORS_NODOMAIN`, `WIX_ACCOUNT_GUESTS_NODOMAIN`, `WIX_ACCOUNT_LOCALSERVICE_NODOMAIN`, `WIX_ACCOUNT_LOCALSYSTEM_NODOMAIN`, `WIX_ACCOUNT_NETWORKSERVICE_NODOMAIN`, and `WIX_ACCOUNT_USERS_NODOMAIN`. Thanks to [@mistoll](https://github.com/mistoll) for the [pull request](https://github.com/wixtoolset/wix/pull/407).
+
+See [Out-of-process bootstrapper applications](/docs/fivefour/oopbas/) for additional extension changes related to building bundles.

src/Docusaurus/docs/fivefour/oopbas.md

@@ -80,7 +80,7 @@ To take advantage of the breaking change, we took the opportunity to improve the
 * `WixToolset.BalUtil` - renamed to `WixToolset.BootstrapperApplicationApi` to provide the native headers and libraries to communicate with Burn. Also, split out the `WixToolset.WixStandardBootstrapperApplicationFunctionApi` for WixStdBA BAFunctions API.
 * `WixToolset.Mba.Core` - merged the managed libraries into the `WixToolset.BootstrapperApplicationApi` so there is a single package for custom bootstrapper applications.
 * `WixToolset.BextUtil` - renamed to `WixToolset.BootstrapperExtensionApi`.
-* `WixToolset.Bal.wixext` - renamed to `WixToolset.BootstrapperApplications.wixext` but also kept `WixToolset.Bal.wixext` for backwards compatibility.
+* `WixToolset.Bal.wixext` - renamed to `WixToolset.BootstrapperApplications.wixext` but also kept `WixToolset.Bal.wixext` for backwards compatibility with `PackageReferences` in MSBuild. Note: this means that if using `wix.exe` to add extensions you will need to use the new name `WixToolset.BootstrapperApplications.wixext`.
 * `WixToolset.Dnc.HostGenerator` - no longer needed in WiX v5.