fix wording

Author: dnadoba

NOTICE.txt

@@ -27,7 +27,7 @@ components that this product depends on.
 -------------------------------------------------------------------------------
 
 
-This product contains a derivation various scripts from SwiftNIO and contains "XCTest+AsyncAwait.swift" from gRPC Swift.
+This product contains derivations of various scripts from SwiftNIO and contains "XCTest+AsyncAwait.swift" from gRPC Swift.
 
   * LICENSE (Apache License 2.0):
     * https://www.apache.org/licenses/LICENSE-2.0