message: core: add some missing comments
diff: @@ -9,9 +9,21 @@ class MavsdkImpl;
  class ServerComponentImpl;
  class ServerPluginImplBase;
  +/**
  + * @brief This class represents a component, used to initialize a server plugin.
  + */
  class ServerComponent {
  public:
  + /**
  + * @private Constructor, used internally
  + *
  + * This constructor is not (and should not be) directly called by application code.
  + */
  ServerComponent(MavsdkImpl& mavsdk_impl, uint8_t component_id);
  +
  + /**
  + * @brief Destructor.
  + */
  ~ServerComponent() = default;
  private:
  