Merge pull request #1010 from petuhovskiy/patch-1

Fix markdown code line

en/02.5.md

@@ -216,7 +216,7 @@ We define some constants and customized types.
 Then we defined some methods for our customized types.
 
 - `Volume()` uses Box as its receiver and returns the volume of Box.
-- `SetColor(`c Color) changes Box's color.
+- `SetColor(c Color)` changes Box's color.
 - `BiggestsColor()` returns the color which has the biggest volume.
 - `PaintItBlack()` sets color for all Box in BoxList to black.
 - `String()` use Color as its receiver, returns the string format of color name.