Update Doxygen docs for util namespace

src/util/error.h

@@ -21,6 +21,10 @@
 
 namespace clanguml::error {
 
+class query_driver_no_paths : public std::runtime_error {
+    using std::runtime_error::runtime_error;
+};
+
 struct uml_alias_missing : public virtual std::runtime_error {
     uml_alias_missing(const std::string &message)
         : std::runtime_error(message)
@@ -28,4 +32,8 @@ struct uml_alias_missing : public virtual std::runtime_error {
     }
 };
 
+class compilation_database_error : public std::runtime_error {
+    using std::runtime_error::runtime_error;
+};
+
 } // namespace clanguml::error