don't mention `--pylab` in R or cell magic notebooks

examples/notebooks/Cell Magics.ipynb

@@ -975,7 +975,7
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "R's console (i.e. its stdout() connection) is captured by ipython, as are any plots which are published as PNG files like the notebook with arguments --pylab inline. As a call to %R may produce a return value (see above) we must ask what happens to a magic like the one below. The R code specifies that something is published to the notebook. If anything is published to the notebook, that call to %R returns None."
+      "R's console (i.e. its stdout() connection) is captured by ipython, as are any plots which are published as PNG files like `%matplotlib inline`. As a call to %R may produce a return value (see above) we must ask what happens to a magic like the one below. The R code specifies that something is published to the notebook. If anything is published to the notebook, that call to %R returns None."
      ]
     },
     {

examples/notebooks/R Magics.ipynb

@@ -323,7 +323,7
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "R's console (i.e. its stdout() connection) is captured by ipython, as are any plots which are published as PNG files like the notebook with arguments --pylab inline. As a call to %R may produce a return value (see above) we must ask what happens to a magic like the one below. The R code specifies that something is published to the notebook. If anything is published to the notebook, that call to %R returns None."
+      "R's console (i.e. its stdout() connection) is captured by ipython, as are any plots which are published as PNG files, as with `%matplotlib inline`. As a call to %R may produce a return value (see above) we must ask what happens to a magic like the one below. The R code specifies that something is published to the notebook. If anything is published to the notebook, that call to %R returns None."
      ]
     },
     {