Fix missing symbols on some platforms

Change-Id: Ie980463d319d49ff9033e0ba5a5bcbdee54713cc

Author: silvakid

devapi/document.cc

@@ -50,7 +50,7 @@ using std::endl;
 // Value::get specialization to allow convertion to common::Value type
 // --------------------
 
-// We need to export this template instantiation
+// // We need to export this template instantiation
 template PUBLIC_API common::Value Value::get<common::Value>() const;
 
 template <>

include/mysqlx/devapi/document.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2020, Oracle and/or its affiliates.
+ * Copyright (c) 2015, 2023, Oracle and/or its affiliates.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2.0, as
@@ -392,6 +392,7 @@ class Value
 
 
   template<typename T>
+  PUBLIC_API
   T get() const;
 
   //@}