BFS doesn't have an upper bound (#508)

re-opening of #461

Author: pontusmelke

modules/ROOT/pages/execution-plans/operators.adoc

@@ -2727,7 +2727,6 @@ This is only used in cases where the individual paths are not of interest.
 This kind of expand is only planned when:
 
 * The individual paths are not of interest.
-* The relationships have an upper bound.
 * The lower bound is either `0` or `1` (default).
 
 This operator guarantees that all the end nodes produced are unique.