Add @since 2.11 for avatarUrl and AvatarSpec (for #1721)

mirai-core-api/src/commonMain/kotlin/contact/AvatarSpec.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2021 Mamoe Technologies and contributors.
+ * Copyright 2019-2022 Mamoe Technologies and contributors.
  *
  * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
  * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
@@ -13,8 +13,8 @@ import net.mamoe.mirai.utils.MiraiInternalApi
 
 /**
  * 头像的规格, [size] 单位为 px.
+ * @since 2.11
  */
-@Suppress("unused")
 public enum class AvatarSpec(@MiraiInternalApi public val size: Int) : Comparable<AvatarSpec> {
     /**
      * 最高压缩等级

mirai-core-api/src/commonMain/kotlin/contact/ContactOrBot.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2021 Mamoe Technologies and contributors.
+ * Copyright 2019-2022 Mamoe Technologies and contributors.
  *
  * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
  * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
@@ -44,6 +44,7 @@ public interface ContactOrBot : CoroutineScope {
     /**
      * 头像下载链接.
      * @param spec 头像的规格.
+     * @since 2.11
      */
     @Suppress("INAPPLICABLE_JVM_NAME")
     @JvmName("getAvatarUrl")

mirai-core-api/src/commonMain/kotlin/contact/Group.kt

@@ -114,6 +114,7 @@ public interface Group : Contact, CoroutineScope, FileSupported, AudioSupported
     /**
      * 群头像下载链接.
      * @param spec 头像的规格.
+     * @since 2.11
      */
     public override fun avatarUrl(spec: AvatarSpec): String = "http://p.qlogo.cn/gh/${id}/${id}/${spec.size}"