Merge pull request #4331 from stifoon/patch-4

[Documentation] Multi-objective management

Author: azime

documentation/slate/source/includes/stuff.md

@@ -13,8 +13,8 @@ return multiple journeys if it cannot know that one is better than the
 other. For example it cannot decide that a one hour journey with no
 connection is better than a 45 minutes journey with one connection
 (it is called the [pareto front](http://en.wikipedia.org/wiki/Pareto_efficiency)).
-The 3 objectives Navitia uses are roughly the arrival datetime, the number of transfers
-and the duration of "walking" (transfers and fallback).
+Navitia uses multiple objectives : arrival datetime, the number of transfers, 
+the duration of "walking" (transfers and fallback), reliability of lines, crowd, etc.
 
 If the user asks for more journeys than the number of journeys given by
 RAPTOR (with the parameter `min_nb_journeys` or `count`), Navitia will