fix typos in comments

Author: etpinard

src/plots/plots.js

@@ -645,7 +645,7 @@ plots.supplyDataDefaults = function(traceIn, i, layout) {
         traceOut._module = _module;
     }
 
-    // gets overwritten in pie and geo
+    // gets overwritten in pie, geo and ternary modules
     if(visible) coerce('hoverinfo', (layout._dataLength === 1) ? 'x+y+z+text' : undefined);
 
     if(_module && visible) _module.supplyDefaults(traceIn, traceOut, defaultColor, layout);

src/traces/scatterternary/attributes.js

@@ -67,7 +67,7 @@ module.exports = {
             'Sets text elements associated with each (a,b,c) point.',
             'If a single string, the same string appears over',
             'all the data points.',
-            'If an array of string, the items are mapped in order to the',
+            'If an array of strings, the items are mapped in order to the',
             'the data points in (a,b,c).'
         ].join(' ')
     }),