Update migration guide

Author: colinrotherham

docs/upgrade-to-6.0.md

@@ -31,6 +31,25 @@ The [panel](https://service-manual.nhs.uk/design-system/components/panel) compon
 
 This replaces the [list panel component](#list-panel) which was removed in NHS.UK frontend v6.0.0.
 
+### Support for React Server Components (RSC)
+
+All components have been tested as React Server Components (RSC) but due to [multipart namespace component limitations](https://ivicabatinic.from.hr/posts/multipart-namespace-components-addressing-rsc-and-dot-notation-issues) an alternative syntax (without dot notation) can be used as a workaround:
+
+```patch
+  <Pagination>
+-   <Pagination.Link href="/section/treatments" previous>
++   <PaginationLink href="/section/treatments" previous>
+      Treatments
+-   </Pagination.Link>
++   </PaginationLink>
+-   <Pagination.Link href="/section/symptoms" next>
++   <PaginationLink href="/section/symptoms" next>
+      Symptoms
+-   </Pagination.Link>
++   </PaginationLink>
+  </Pagination>
+```
+
 ## Breaking changes
 
 ### Update the JavaScript supported script snippet