publish variadic functions. also, spelling

examples/variadic-functions/variadic-functions.go

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+// [_Variadic functions_](http://en.wikipedia.org/wiki/Variadic_function)
+// can be called with any number of trailing arguments.
+// For example, `fmt.Println` is a common variadic
+// function.
+
+package main
+
+import "fmt"
+
+// Here's a function that will take an arbitrary number
+// of `ints` as arguments.
+func sum(nums ...int) int {
+    fmt.Print(nums, " ")
+    total := 0
+    for _, num := range nums {
+        total += num
+    }
+    return total
+}
+
+func main() {
+
+    // Variadic functions can be called in the usual way
+    // with individual arguments.
+    fmt.Println(sum(1, 2))
+    fmt.Println(sum(1, 2, 3))
+
+    // If you already have multiple args in a slice,
+    // apply them to a variadic function using
+    // `func(slice...)` like this.
+    nums := []int{1, 2, 3, 4}
+    fmt.Println(sum(nums...))
+}