Fixes #14469: updated RFC links [skip ci]

framework/web/BadRequestHttpException.php

@@ -15,7 +15,7 @@ namespace yii\web;
  * case, consider using the more precise exception to provide the user with
  * additional information.
  *
- * @link https://tools.ietf.org/html/rfc2616#section-10.4.1
+ * @see https://tools.ietf.org/html/rfc7231#section-6.5.1
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */

framework/web/ConflictHttpException.php

@@ -10,7 +10,7 @@ namespace yii\web;
 /**
  * ConflictHttpException represents a "Conflict" HTTP exception with status code 409
  *
- * @link https://tools.ietf.org/html/rfc2616#section-10.4.10
+ * @see https://tools.ietf.org/html/rfc7231#section-6.5.8
  * @author Dan Schmidt <danschmidt5189@gmail.com>
  * @since 2.0
  */

framework/web/ForbiddenHttpException.php

@@ -15,7 +15,7 @@ namespace yii\web;
  * If you do not want to expose authorization information to the user, it is valid
  * to respond with a 404 [[NotFoundHttpException]].
  *
- * @link https://tools.ietf.org/html/rfc7231#section-6.5.3
+ * @see https://tools.ietf.org/html/rfc7231#section-6.5.3
  * @author Dan Schmidt <danschmidt5189@gmail.com>
  * @since 2.0
  */

framework/web/GoneHttpException.php

@@ -15,7 +15,7 @@ namespace yii\web;
  * for that record should return a 410 GoneHttpException instead of a 404
  * [[NotFoundHttpException]].
  *
- * @link https://tools.ietf.org/html/rfc2616#section-10.4.11
+ * @see https://tools.ietf.org/html/rfc7231#section-6.5.9
  * @author Dan Schmidt <danschmidt5189@gmail.com>
  * @since 2.0
  */

framework/web/MethodNotAllowedHttpException.php

@@ -10,6 +10,7 @@ namespace yii\web;
 /**
  * MethodNotAllowedHttpException represents a "Method Not Allowed" HTTP exception with status code 405.
  *
+ * @see https://tools.ietf.org/html/rfc7231#section-6.5.5
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */

framework/web/NotAcceptableHttpException.php

@@ -14,7 +14,7 @@ namespace yii\web;
  * application cannot return. Note that, according to the HTTP 1.1 specification,
  * you are not required to respond with this status code in this situation.
  *
- * @link https://tools.ietf.org/html/rfc2616#section-10.4.7
+ * @see https://tools.ietf.org/html/rfc7231#section-6.5.6
  * @author Dan Schmidt <danschmidt5189@gmail.com>
  * @since 2.0
  */

framework/web/NotFoundHttpException.php

@@ -10,6 +10,7 @@ namespace yii\web;
 /**
  * NotFoundHttpException represents a "Not Found" HTTP exception with status code 404.
  *
+ * @see https://tools.ietf.org/html/rfc7231#section-6.5.4
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */

framework/web/ServerErrorHttpException.php

@@ -10,6 +10,7 @@ namespace yii\web;
 /**
  * ServerErrorHttpException represents an "Internal Server Error" HTTP exception with status code 500.
  *
+ * @see https://tools.ietf.org/html/rfc7231#section-6.6.1
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */

framework/web/TooManyRequestsHttpException.php

@@ -14,7 +14,7 @@ namespace yii\web;
  * given period of time. For example, you would throw this exception when
  * 'throttling' an API user.
  *
- * @link http://tools.ietf.org/search/rfc6585#section-4
+ * @see https://tools.ietf.org/html/rfc6585#section-4
  * @author Dan Schmidt <danschmidt5189@gmail.com>
  * @since 2.0
  */

framework/web/UnsupportedMediaTypeHttpException.php

@@ -15,7 +15,7 @@ namespace yii\web;
  * if the client POSTs XML data to an action or controller that only accepts
  * JSON.
  *
- * @link https://tools.ietf.org/html/rfc2616#section-10.4.16
+ * @see https://tools.ietf.org/html/rfc7231#section-6.5.13
  * @author Dan Schmidt <danschmidt5189@gmail.com>
  * @since 2.0
  */