Merge #9544: [trivial] Add end of namespace comments. Improve consistency.

5a9b508 [trivial] Add end of namespace comments (practicalswift)

Tree-SHA512: 92b0fcae4d1d3f4da9e97569ae84ef2d6e09625a5815cd0e5f0eb6dd2ecba9852fa85c184c5ae9de5117050330ce995e9867b451fa8cd5512169025990541a2b

src/validation.cpp

@@ -1297,7 +1297,7 @@ bool AbortNode(CValidationState& state, const std::string& strMessage, const std
     return state.Error(strMessage);
 }
 
-} // anon namespace
+} // namespace
 
 enum DisconnectResult
 {