Remove extra semi colon from proxygen/facebook/httpclient/ssl/Root.h

Summary:
`-Wextra-semi` or `-Wextra-semi-stmt`

If the code compiles, this is safe to land.

Reviewed By: palmje

Differential Revision: D51995057

fbshipit-source-id: 05f58f760d946b85ab5e4c364cbb32262fdc3113

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) {