doc: add docment for UpperCamelCase

Author: dudaodong

README.md

@@ -1997,7 +1997,7 @@ import "github.com/duke-git/lancet/v2/strutil"
     [[play](https://go.dev/play/p/9eXP3tn2tUy)]
 -   **<big>UpperCamelCase</big>** : coverts source string to its UpperCamelCase string.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#UpperCamelCase)]
-    [[play](https://go.dev/play/p/todo)]
+    [[play](https://go.dev/play/p/vPHszjTXSFp)]
 -   **<big>Capitalize</big>** : converts the first character of source string to upper case and the remaining to lower case.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/en/api/packages/strutil.md#Capitalize)]
     [[play](https://go.dev/play/p/2OAjgbmAqHZ)]

README_zh-CN.md

@@ -2004,7 +2004,7 @@ import "github.com/duke-git/lancet/v2/strutil"
     [[play](https://go.dev/play/p/9eXP3tn2tUy)]
 -   **<big>UpperCamelCase</big>** : 将字符串转换为CamelCase大写驼峰式字符串, 非字母和数字会被忽略。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/api/packages/strutil.md#UpperCamelCase)]
-    [[play](https://go.dev/play/p/todo)]
+    [[play](https://go.dev/play/p/vPHszjTXSFp)]
 -   **<big>Capitalize</big>** : 将字符串的第一个字符转换为大写。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/api/packages/strutil.md#Capitalize)]
     [[play](https://go.dev/play/p/2OAjgbmAqHZ)]

docs/api/packages/strutil.md

@@ -276,7 +276,7 @@ func main() {
 func UpperCamelCase(s string) string
 ```
 
-<b>示例:<span style="float:right;display:inline-block;">[运行](https://go.dev/play/p/todo)</span></b>
+<b>示例:<span style="float:right;display:inline-block;">[运行](https://go.dev/play/p/65Q6iYhLRTa)</span></b>
 
 ```go
 import (

docs/en/api/packages/strutil.md

@@ -276,7 +276,7 @@ func main() {
 func UpperCamelCase(s string) string
 ```
 
-<b>Example:<span style="float:right;display:inline-block;">[Run](https://go.dev/play/p/todo)</span></b>
+<b>Example:<span style="float:right;display:inline-block;">[Run](https://go.dev/play/p/vPHszjTXSFp)</span></b>
 
 ```go
 import (

strutil/string.go

@@ -35,7 +35,7 @@ func CamelCase(s string) string {
 }
 
 // UpperCamelCase coverts string to UpperCamelCase string. Non letters and numbers will be ignored.
-// Play: https://go.dev/play/p/todo
+// Play: https://go.dev/play/p/vPHszjTXSFp
 func UpperCamelCase(s string) string {
 	var builder strings.Builder