Update MLMD notebook to use pipeline submit() method (#215)

notebooks/official/ml_metadata/vertex-pipelines-ml-metadata.ipynb

@@ -912,7 +912,7 @@
       },
       "outputs": [],
       "source": [
-        "run1.run()"
+        "run1.submit()"
       ]
     },
     {
@@ -921,7 +921,7 @@
         "id": "6e682e41af78"
       },
       "source": [
-        "After the first pipeline job is started successfully and you see a `PipelineState.PIPELINE_STATE_RUNNING` message, you can stop that cell and run the second job. Stop the cell by clicking the square stop button at the top of your notebook. This won't affect the pipeline currently running. Once you've stopped the cell, you can run the second pipeline:"
+        "Then, kick off the second run:"
       ]
     },
     {
@@ -932,7 +932,7 @@
       },
       "outputs": [],
       "source": [
-        "run2.run()"
+        "run2.submit()"
       ]
     },
     {