Clarify v6.1.2 doco

Author: reisenberger

CHANGELOG.md

@@ -1,5 +1,5 @@
 ## 6.1.2
-- Bug Fix: Async continuation control for async executions (issue 540)
+- Bug Fix: Async continuation control for async executions (issue 540, affected only v6.1.1)
 
 ## 6.1.1
 - Bug Fix: Context.PolicyKey behaviour in PolicyWrap (issue 510)

src/Polly.nuspec

@@ -14,7 +14,7 @@
     <copyright>Copyright © 2018, App vNext</copyright>
     <releaseNotes>     6.1.2
      ---------------------
-     - Bug Fix: Async continuation control for async executions (issue 540)
+     - Bug Fix: Async continuation control for async executions (issue 540, affected only v6.1.1)
 
      6.1.1
      ---------------------