fix: 选择排序(#6)

Author: ConardLi

docs/algorithm/排序/选择排序.md

@@ -15,7 +15,7 @@
 
 ```js
     function selectionSort(array) {
-      for (let i = 0; i < array.length; i++) {
+      for (let i = 0; i < array.length - 1; i++) {
         let minIndex = i;
         for (let j = i + 1; j < array.length; j++) {
           if (array[j] < array[minIndex]) {

算法分类/排序/选择排序.md

@@ -8,7 +8,7 @@
 
 ```js
     function selectionSort(array) {
-      for (let i = 0; i < array.length; i++) {
+      for (let i = 0; i < array.length - 1; i++) {
         let minIndex = i;
         for (let j = i + 1; j < array.length; j++) {
           if (array[j] < array[minIndex]) {