Update documentation

docs/outputs.html

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 <p>Multiple outputs are available by including a configuration dictionary containing a <code>multipleOutputs</code> entry as the third argument of the <code>MathCell()</code> command. The value for this key is then an array of arbitrary numerical values indicating the layout of the outputs. The data for the <code>evaluate()</code> function should then be an array of the usual data arrays. The configuration supplied to this function can either be a single dictionary for identical formatting of all outputs or an array of individual dictionaries.</p>
 
+<p>Both two- and three-dimensional outputs automatically omit nonnumerical data points. This allows the graphic to appear at least in part, but be aware that this occurs.</p>
+
 <br/><p>An <code>svg</code> output displays a two-dimensional plot of the data. The input data should be an array of arrays of data points, <i>i.e.</i> a three-dimensional array. The output has the options and default values</p>
 
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