namespace-concat in fbcode/quic

Summary:
Concatenate adjacent namespaces + format

This is a codemod. It was automatically generated and will be landed once it is approved and tests are passing in sandcastle.
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Autodiff project: nc
Autodiff partition: fbcode.quic
Autodiff bookmark: ad.nc.fbcode.quic

Reviewed By: hanidamlaj

Differential Revision: D65365244

fbshipit-source-id: 0bbaa7684d03caf8fc8eff3439a0865940398220

quic/server/handshake/test/AppTokenTest.cpp

@@ -17,8 +17,7 @@
 
 #include <cstdint>
 
-namespace quic {
-namespace test {
+namespace quic::test {
 
 void expectAppTokenEqual(
     const Optional<AppToken>& decodedAppToken,
@@ -273,5 +272,4 @@ TEST(AppTokenTest, TestEncodeAndDecodeCwndHint) {
   expectAppTokenEqual(decodeAppToken(*buf), appToken);
 }
 
-} // namespace test
-} // namespace quic
+} // namespace quic::test