[Editorial] Update "files associated with GTFS-Fares V2" (google#539)

* Update fares v2 files

* add 2 files

Author: tzujenchanmbd

gtfs/spec/en/reference.md

@@ -355,7 +355,7 @@ File: **Optional**
 Primary key (`fare_id`)
 
 **Versions**<br>
-There are two modelling options for describing fares. GTFS-Fares V1 is the legacy option for describing minimal fare information. GTFS-Fares V2 is an updated method that allows for a more detailed account of an agency's fare structure. Both are allowed to be present in a dataset, but only one method should be used by a data consumer for a given dataset. It is recommended that GTFS-Fares V2 takes precedence over GTFS-Fares V1. <br><br>The files associated with GTFS-Fares V1 are: <br>- [fare_attributes.txt](#fare_attributestxt)<br>- [fare_rules.txt](#fare_rulestxt)<br><br>The files associated with GTFS-Fares V2 are: <br>- [fare_media.txt](#fare_mediatxt)<br>- [fare_products.txt](#fare_productstxt)<br>- [fare_leg_rules.txt](#fare_leg_rulestxt)<br>- [fare_transfer_rules.txt](#fare_transfer_rulestxt)
+There are two modelling options for describing fares. GTFS-Fares V1 is the legacy option for describing minimal fare information. GTFS-Fares V2 is an updated method that allows for a more detailed account of an agency's fare structure. Both are allowed to be present in a dataset, but only one method should be used by a data consumer for a given dataset. It is recommended that GTFS-Fares V2 takes precedence over GTFS-Fares V1. <br><br>The files associated with GTFS-Fares V1 are: <br>- [fare_attributes.txt](#fare_attributestxt)<br>- [fare_rules.txt](#fare_rulestxt)<br><br>The files associated with GTFS-Fares V2 are: <br>- [fare_media.txt](#fare_mediatxt)<br>- [fare_products.txt](#fare_productstxt)<br>- [rider_categories.txt](#rider_categoriestxt)<br>- [fare_leg_rules.txt](#fare_leg_rulestxt)<br>- [fare_leg_join_rules.txt](#fare_leg_join_rulestxt)<br>- [fare_transfer_rules.txt](#fare_transfer_rulestxt)<br>- [timeframes.txt](#timeframestxt)<br>- [networks.txt](#networkstxt)<br>- [route_networks.txt](#route_networkstxt)<br>- [areas.txt](#areastxt)<br>- [stop_areas.txt](#stop_areastxt)
 
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