Update some example notebook with Shift-Tab

examples/notebooks/Part 1 - Running Code.ipynb

@@ -234,7 +234,7 b''
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Tab completion after `(` brings up a tooltip with the docstring:"
+      "Shift-Tab on selection, or after `(` brings up a tooltip with the docstring:"
      ]
     },
     {
@@ -436,4 +436,4 b''
    "metadata": {}
   }
  ]
-}
  No newline at end of file
+}