grammar fix (#1202)

* grammar fix

Minor change, but makes it more readable.

* Update nugetreadme.txt

Co-authored-by: James Montemagno <james.montemagno@gmail.com>

nugetreadme.txt

@@ -12,8 +12,4 @@ https://aka.ms/essentials-getstarted
 
 ## Release Notes
 
-If you are upgrading from an earlier preview the stable version contains several breaking API changes. 
-
-We have documented a full transition guide when migrating from older versions. 
-
 See our full release notes for more information: https://aka.ms/essentials-releasenotes