Change ns-sameness position statement to RELEASED

Follows the example of
https://github.com/kubernetes/community/blob/master/sig-api-machinery/api-extensions-position-statement.md

Also fixes a typo

sig-multicluster/namespace-sameness-position-statement.md

@@ -1,8 +1,8 @@
 # Namespace Sameness - SIG Multicluster Position Statement
 
 Author: Jeremy Olmsted-Thompson (**[@jeremyot](https://github.com/jeremyot)**), Google  
-Last Edit: 2020/03/24  
-Status: IN REVIEW  
+Last Edit: 2020/04/20  
+Status: RELEASED
 
 ## Goal
 To establish a normative statement for multi-cluster namespace semantics and