Merge pull request #522 from jubalh/typo1

Fix typo in SetColumns() documentation

grid.go

@@ -92,7 +92,7 @@ func NewGrid() *Grid {
 // following call will result in columns with widths of 30, 10, 15, 15, and 30
 // cells:
 //
-//   grid.Setcolumns(30, 10, -1, -1, -2)
+//   grid.SetColumns(30, 10, -1, -1, -2)
 //
 // If a primitive were then placed in the 6th and 7th column, the resulting
 // widths would be: 30, 10, 10, 10, 20, 10, and 10 cells.