remove comment

It looks like there's a typo at the beginning, and I couldn't think of a
good way to describe `client_id` concisely, so probably best to omit the
comment.

src/datadog/remote_config.h

@@ -46,7 +46,7 @@ class RemoteConfigurationManager {
 
   TracerSignature tracer_signature_;
   std::shared_ptr<ConfigManager> config_manager_;
-  std::string client_id_;  ///< Identifier a `RemoteConfigurationManager`
+  std::string client_id_;
 
   State state_;
   std::unordered_map<std::string, Configuration> applied_config_;