change what's new author to bill (#49429)

Author: gewarren

docfx.json

@@ -369,7 +369,7 @@
                 "docs/core/tools/**/**.md": "meaghanlewis",
                 "docs/core/tutorials/**/**.md": "meaghanlewis",
                 "docs/core/versions/**/**.md": "billwagner",
-                "docs/core/whats-new/**/**.md": "gewarren",
+                "docs/core/whats-new/**/**.md": "billwagner",
                 "docs/csharp/**/*.*": "billwagner",
                 "docs/framework/**/**.md": "gewarren",
                 "docs/framework/additional-apis/pos-for-net/**/**.md": "TerryWarwick",
@@ -462,7 +462,7 @@
                 "docs/core/tools/**/**.md": "mosagie",
                 "docs/core/tutorials/**/**.md": "mosagie",
                 "docs/core/versions/**/**.md": "wiwagn",
-                "docs/core/whats-new/**/**.md": "gewarren",
+                "docs/core/whats-new/**/**.md": "wiwagn",
                 "docs/csharp/**/*.*": "wiwagn",
                 "docs/framework/**/**.md": "dotnetcontent",
                 "docs/framework/app-domains/**/**.md": "gewarren",