Update installpackage_Spark.ipynb

Update PySpark instructions

samples/features/sql-big-data-cluster/spark/config-install/installpackage_Spark.ipynb

@@ -104,7 +104,7 @@
                 "# Install Python Packages at Runtime for use with PySpark\n",
                 "\n",
                 "The following code can be used to install packages on each executor node at runtime. \\\n",
-                "**Note**: This installation is temporary, and must be performed each time a new Spark session is invoked.\n",
+                "**Note**: This functionality is not available on a non-root BDC deployment (including OpenShift). This installation is temporary, and must be performed each time a new Spark session is invoked.\n",
                 "\n",
                 "``` Python\n",
                 "import subprocess\n",
@@ -137,4 +137,4 @@
             }
         }
     ]
-}
+}