Update 1.3 release notes with void accept changes (#2443)

releasenotes/releasenotes-1.3.0-rc.md

@@ -4,6 +4,10 @@
 
 
 ## New API features
+  - Void accept behavior (https://github.com/microsoft/Power-Fx/pull/2096): There are three main changes related to `Void` type:
+    - Void will accept all types, including Void.
+    - Void will not be accepted by any other types (except Void). Trying to use the output from Set will result in an error.
+    - The following functions will return Void: Set, Clear, Remove, Notify (Repl), Help (Repl), Exit (Repl). Future functions that have no return value will return Void. 
   - Summarize (https://github.com/microsoft/Power-Fx/pull/2317): A new Power Fx function that combines grouping and aggregation in one call.
 
 `Summarize( Table, GroupByColumn1 [, GroupByColumn2 …], AggregateExpr1 As Name [, AggregateExpr1 As Name …] )`