update formatting reference link (#19157)

docs/guide-fr/tutorial-i18n.md

@@ -217,7 +217,7 @@ Vous pouvez aussi spécifier un motif personnalisé pour formater la date :
 echo \Yii::t('app', 'Today is {0,date,yyyy-MM-dd}', time());
 ```
 
-Voir [Formatting reference](http://icu-project.org/apiref/icu4c/classicu_1_1SimpleDateFormat.html#details).
+Voir [Formatting reference](https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1SimpleDateFormat.html#details).
 
 
 #### Heure <span id="time"></span>

docs/guide-ja/tutorial-i18n.md

@@ -326,7 +326,7 @@ echo \Yii::t('app', 'Today is {0,date,yyyy-MM-dd}', time());
 // 日本語出力: '今日は 2015-01-07 です。'
 ```
 
-[書式のリファレンス](http://icu-project.org/apiref/icu4c/classicu_1_1SimpleDateFormat.html#details).
+[書式のリファレンス](https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1SimpleDateFormat.html#details).
 
 #### 時刻 <span id="time"></span>
 

docs/guide-ru/tutorial-i18n.md

@@ -182,7 +182,7 @@ echo \Yii::t('app', 'Today is {0, date, short}', time());
 echo \Yii::t('app', 'Today is {0, date,yyyy-MM-dd}', time());
 ```
 
-[Описание форматирования](http://icu-project.org/apiref/icu4c/classicu_1_1SimpleDateFormat.html#details).
+[Описание форматирования](https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1SimpleDateFormat.html#details).
 
 #### Время
 

docs/guide-zh-CN/tutorial-i18n.md

@@ -302,7 +302,7 @@ echo \Yii::t('app', 'Today is {0, date, short}', time());
 echo \Yii::t('app', 'Today is {0, date, yyyy-MM-dd}', time());
 ```
 
-[格式化参考](http://icu-project.org/apiref/icu4c/classicu_1_1SimpleDateFormat.html#details)。
+[格式化参考](https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1SimpleDateFormat.html#details)。
 
 
 #### 时间（Time） <span id="time"></span>

docs/guide/tutorial-i18n.md

@@ -302,7 +302,7 @@ You can also specify a custom pattern to format the date value:
 echo \Yii::t('app', 'Today is {0,date,yyyy-MM-dd}', time());
 ```
 
-[Formatting reference](http://icu-project.org/apiref/icu4c/classicu_1_1SimpleDateFormat.html#details).
+[Formatting reference](https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1SimpleDateFormat.html#details).
 
 
 #### Time <span id="time"></span>