docs(graphql): comments about queries that need fixing in v3.0.x

BREAKING CHANGE: file uploads and GraphQL queries (namespace variable)

lib/gtfs/util/graphql.js

@@ -39,6 +39,7 @@ query routeQuery($namespace: String) {
 }
 `
 
+// FIXME: Pattern stats are not supported yet in gtfs-api, so this is broken.
 export const patterns = `
 query patternsQuery($namespace: String, $routeId: [String], $date: String, $from: Long, $to: Long) {
   feed (namespace: $namespace, route_id: $routeId) {
@@ -168,6 +169,7 @@ export const stopsAndRoutes = (namespace: string, routeId: ?string, stopId: ?str
   }
 `
 
+// FIXME: Stop stats are not supported yet in gtfs-api, so this is broken.
 // TODO: add back in patternId filter
 export function stopsFiltered (
   namespace: ?string,