Update 20220713-sig-open-xla.md

Author: ematejska

rfcs/20220713-sig-open-xla.md

@@ -1,6 +1,6 @@
 # RFC: Establish SIG OpenXLA
 
-| Status        | Proposed     |
+| Status        | Accepted     |
 :-------------- |:---------------------------------------------------- |
 | **RFC #**     | [419](https://github.com/tensorflow/community/pull/419)|
 | **Author(s)** | Thea Lamkin ([email protected]), Mehdi Amini ([email protected]) |