Namespace doesn't need to be followed by semicolon

Summary:
Auto-generated with
```
fbgs "}; // namespace" -l | sort | uniq | sed 's/fbsource.//' | xargs -n 50 sed -i 's_}; // namespace_} // namespace_'
```

Reviewed By: dmm-fb

Differential Revision: D51029740

fbshipit-source-id: 177e3f6e6b0ab7e986b1147952cd5e2f59d4b1fc

proxygen/httpclient/samples/H3Datagram/H3DatagramClient.cpp

@@ -143,7 +143,7 @@ class DatagramClient
   std::array<char, kMaxReadBufferSize> buf_;
   bool closing_{false};
 };
-}; // namespace
+} // namespace
 
 int main(int argc, char* argv[]) {
 #if FOLLY_HAVE_LIBGFLAGS

proxygen/httpserver/samples/hq/FizzContext.cpp

@@ -138,7 +138,7 @@ MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQg/NeWSkmQEmaO2f0T
 VnFqMCnjdeFhc/LA6rx3ALn2jfDj9jQR0QGRouFA7NbYZFx7Uj3HOw0/
 -----END PRIVATE KEY-----
 )";
-}; // namespace
+} // namespace
 
 namespace quic::samples {
 FizzServerContextPtr createFizzServerContext(const HQServerParams& params) {

proxygen/lib/http/session/HQStreamBase.cpp

@@ -103,4 +103,4 @@ size_t HQStreamBase::generateStreamPreface() {
   CHECK(!res.hasError());
   return res.value();
 }
-}; // namespace proxygen
+} // namespace proxygen

proxygen/lib/http/session/test/MockQuicSocketDriver.h

@@ -1778,6 +1778,6 @@ class MockQuicSocketDriver : public folly::EventBase::LoopCallback {
   folly::SocketAddress peerAddress_;
   std::shared_ptr<proxygen::MockAsyncTransportCertificate> mockCertificate{
       std::make_shared<proxygen::MockAsyncTransportCertificate>()};
-}; // namespace quic
+} // namespace quic
 
 } // namespace quic

proxygen/lib/transport/test/H3DatagramAsyncSocketTest.h

@@ -91,4 +91,4 @@ class H3DatagramAsyncSocketTest : public testing::Test {
   proxygen::H3DatagramAsyncSocket::Options options_;
   char buf_[kMaxDatagramSize];
 };
-}; // namespace proxygen
+} // namespace proxygen