Update ballerina/annotations.bal

Co-authored-by: Dulmina Renuke <rdulmina@gmail.com>

Author: hasithaa

ballerina/annotations.bal

@@ -44,4 +44,4 @@ public annotation Process on function;
 #     // Send email using external service
 # }
 # ```
-public annotation Activity on function;
+public annotation Activity on function;