minor fixes (#1614)

Co-authored-by: Joseph Damiba <Joseph.damiba@plot.ly>

Author: 2 people

_posts/plotly_js/basic/area/2015-04-09-area_plotly_js_index.html

@@ -8,7 +8,7 @@
 order: 8
 permalink: javascript/filled-area-plots/
 redirect_from: javascript-graphing-library/filled-area-plots/
-thumbnail: thumbnail/area.jpg
+thumbnail: thumbnail/area1.jpg
 ---
 
 {% assign examples = site.posts | where:"language","plotly_js" | where:"suite","area" | sort: "order" %}

_posts/plotly_js/basic/bar/2015-08-07-barchart-direct-labels.html

@@ -31,7 +31,8 @@
 var data = [trace1];
 
 var layout = {
- title: 'January 2013 Sales Report'
+ title: 'January 2013 Sales Report',
+ barmode: 'stack’
 };
 
 Plotly.newPlot('myDiv', data, layout);

_posts/plotly_js/basic/mixed/2015-04-09-mixed_plotly_js_index.html

@@ -8,7 +8,7 @@
 order: 15
 permalink: javascript/graphing-multiple-chart-types/
 redirect_from: javascript-graphing-library/graphing-multiple-chart-types/
-thumbnail: thumbnail/multiple-chart-type.jpg
+thumbnail: thumbnail/mixed2.jpg
 ---
 
 {% assign examples = site.posts | where:"language","plotly_js" | where:"suite","mixed" | sort: "order" %}