Fix image name

Dimuon_Python_Distributed_Dask.ipynb

@@ -49,7 +49,7 @@
    "source": [
     "An `RDataFrame` analysis written in Python can be executed both *locally* - possibly in parallel on the cores of the machine - and *distributedly* by offloading computations to external resources, including [Spark](https://spark.apache.org/) and Dask clusters. This feature is enabled by the architecture depicted below, which shows that RDataFrame computation graphs can be mapped to different kinds of resources via backends. In this notebook we will exercise the Dask backend, which divides an `RDataFrame` input dataset in logical ranges and submits computations for each of those ranges to Dask resources.\n",
     "\n",
-    "<img src=\"DistRDF_Dask.png\" alt=\"Distributed RDataFrame\">"
+    "<img src=\"DistRDF_architecture.png\" alt=\"Distributed RDataFrame\">"
    ]
   },
   {