add wikipedia link for DRY explanation

docs/01-Chart-Configuration.md

@@ -21,7 +21,7 @@ var chartInstance = new Chart(ctx, {
 
 ### Global Configuration
 
-This concept was introduced in Chart.js 1.0 to keep configuration DRY, and allow for changing options globally across chart types, avoiding the need to specify options for each instance, or the default for a particular chart type.
+This concept was introduced in Chart.js 1.0 to keep configuration [DRY](https://en.wikipedia.org/wiki/Don%27t_repeat_yourself), and allow for changing options globally across chart types, avoiding the need to specify options for each instance, or the default for a particular chart type.
 
 Chart.js merges the options object passed to the chart with the global configuration using chart type defaults and scales defaults appropriately. This way you can be as specific as you would like in your individual chart configuration, while still changing the defaults for all chart types where applicable. The global general options are defined in `Chart.defaults.global`. The defaults for each chart type are discussed in the documentation for that chart type.
 
@@ -408,4 +408,4 @@ img.onload = function() {
     })
 }
 
-```
+```