Update upstream.md

Co-authored-by: Francesco Pham <[email protected]>
Signed-off-by: Stefan Schmidt <[email protected]>

upstream.md

@@ -45,8 +45,8 @@ Any change that is also applicable to OpenHarmony upstream we need to propose a
 pull request against the master branch in Gitee. By doing so we get crucial
 feedback from OpenHarmony developers. This will help in the design and
 implementation of changes to fit well into the existing code base. And secondly,
-any change that can be upstreamed will come back to Eclipse Oniro with the next
-release sync and reduce the maintenance burden to carry patches downstream.
+any changes viable for upstream inclusion will return to Eclipse Oniro with the next
+release synchronization, reducing the maintenance burden to carry patches downstream.
 
 Should a fix be integrated upstream, efforts should be directed towards backporting 
 it into the current release. This ensures its inclusion in our ongoing cycle.