Update foreachwhile readme.md (#508)

* update readme.md for lo.ForEachWhile play and example code

---------

Co-authored-by: Samuel Berthe <dev@samuel-berthe.fr>

README.md

@@ -434,18 +434,19 @@ Iterates over collection elements and invokes iteratee for each element collecti
 ```go
 list := []int64{1, 2, -42, 4}
 
-ForEachWhile(list, func(x int64, _ int) bool {
-    if x < 0 {
-        return false
-    }
-    fmt.Println(x)
-    return true
+lo.ForEachWhile(list, func(x int64, _ int) bool {
+	if x < 0 {
+		return false
+	}
+	fmt.Println(x)
+	return true
 })
-
 // 1
 // 2
 ```
 
+[[play](https://go.dev/play/p/QnLGt35tnow)]
+
 ### Times
 
 Times invokes the iteratee n times, returning an array of the results of each invocation. The iteratee is invoked with index as argument.

slice.go

@@ -95,7 +95,8 @@ func ForEach[T any](collection []T, iteratee func(item T, index int)) {
 }
 
 // ForEachWhile iterates over elements of collection and invokes iteratee for each element
-// collection  return value  decide to continue or break ,just like do while()
+// collection return value decide to continue or break, like do while().
+// Play: https://go.dev/play/p/QnLGt35tnow
 func ForEachWhile[T any](collection []T, iteratee func(item T, index int) (goon bool)) {
 	for i := range collection {
 		if !iteratee(collection[i], i) {