Update particle_containers.py

Author: EyaDammak

Python/pywarpx/particle_containers.py

@@ -775,7 +775,7 @@ def get_particle_boundary_buffer(self, species_name, boundary, comp_name, level)
                 The component of the array data that will be returned.
                 "x", "y", "z", "ux", "uy", "uz", "w"
 
-                "stepScraped","timeScraped",
+                "stepScraped","deltaTimeScraped",
                 if boundary='eb': "nx", "ny", "nz"
 
             level          : int