describe hovertemplate variables for scatter(gl)

Author: antoinerg

src/traces/scatter/attributes.js

@@ -204,7 +204,9 @@ module.exports = {
             'or text, then the default is *fills*, otherwise it is *points*.'
         ].join(' ')
     },
-    hovertemplate: hovertemplateAttrs(),
+    hovertemplate: hovertemplateAttrs({}, {
+        keys: ['marker.size', 'marker.color']
+    }),
     line: {
         color: {
             valType: 'color',

src/traces/scattergl/attributes.js

@@ -98,4 +98,4 @@ var attrs = module.exports = overrideAll({
 }, 'calc', 'nested');
 
 attrs.x.editType = attrs.y.editType = attrs.x0.editType = attrs.y0.editType = 'calc+clearAxisTypes';
-attrs.hovertemplate = hovertemplateAttrs();
+attrs.hovertemplate = scatterAttrs.hovertemplate;