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

example/client/KatranSimpleClient.cpp

@@ -57,7 +57,7 @@ const std::map<std::string, uint64_t> vipFlagTranslationTable = {
 const std::map<std::string, uint32_t> realFlagTranslationTable = {
     {"LOCAL_REAL", LOCAL_REAL},
 };
-}; // namespace
+} // namespace
 
 namespace lb {
 namespace katran {