Update documentation

pipeline/includes/data_model/location.h

@@ -1,15 +1,36 @@
 #ifndef BIERGARTEN_PIPELINE_MODELS_LOCATION_H_
 #define BIERGARTEN_PIPELINE_MODELS_LOCATION_H_
 
+/**
+ * @file data_model/location.h
+ * @brief Location data model used throughout generation pipeline.
+ */
+
 #include <string>
 
+/**
+ * @brief Canonical location record for city-level generation.
+ */
 struct Location {
+   /// @brief City name.
    std::string city;
+
+   /// @brief State or province name.
    std::string state_province;
+
+   /// @brief ISO 3166-2 subdivision code.
    std::string iso3166_2;
+
+   /// @brief Country name.
    std::string country;
+
+   /// @brief ISO 3166-1 country code.
    std::string iso3166_1;
+
+   /// @brief Latitude in decimal degrees.
    double latitude;
+
+   /// @brief Longitude in decimal degrees.
    double longitude;
 };