fix syntax

Author: antoinerg

Diff for: src/components/fx/hovertemplate_attributes.js

@@ -40,7 +40,7 @@ module.exports = function(opts, extra) {
             'Numbers are formatted using d3-format\'s syntax %{variable:d3-format}, for example "Price: %{y:$.2f}".',
             'See https://github.com/d3/d3-format/blob/master/README.md#locale_format for details on the formatting syntax.',
             'The variables available in `hovertemplate` are the ones emitted as event data described at this link https://plot.ly/javascript/plotlyjs-events/#event-data.',
-            'Additionally, every attributes that can be specified per-point (the ones that are `arrayOk: true`) are available.'
+            'Additionally, every attributes that can be specified per-point (the ones that are `arrayOk: true`) are available.',
             descPart
         ].join(' ')
     };