Fix build

Summary: related to T15996

Reviewers: iljazovic

Reviewed By: iljazovic

Subscribers: miljen

Differential Revision: https://repo.mireo.local/D33388

include/boost/mqtt5/impl/autoconnect_stream.hpp

@@ -25,7 +25,7 @@
 #include <cstdint>
 #include <memory>
 #include <string>
-#include <utility>
+#include <variant> // std::monostate
 
 namespace boost::mqtt5::detail {
 

include/boost/mqtt5/impl/client_service.hpp

@@ -26,7 +26,7 @@
 #include <memory>
 #include <string>
 #include <type_traits>
-#include <utility>
+#include <variant> // std::monostate
 
 namespace boost::mqtt5::detail {
 

include/boost/mqtt5/types.hpp

@@ -142,7 +142,7 @@ enum class retain_handling_e : std::uint8_t {
  * \brief Represents the \__SUBSCRIBE_OPTIONS\__ associated with each Subscription.
  */
 struct subscribe_options {
-    /** \brief Maximum \__QOS\__ level at which the Server can send Application Messages to the Client.
+    /** \brief Maximum \__QOS\__ level at which the Server can send Application Messages to the Client. */
     qos_e max_qos = qos_e::exactly_once;
 
     /** \brief Option determining if Application Messages will be