Rename `instanceWhose` to `getInstance`

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt

@@ -59,7 +59,7 @@ abstract class Bot : CoroutineScope {
          * 获取一个 [Bot] 实例, 找不到则 [NoSuchElementException]
          */
         @JvmStatic
-        fun getInstance(qq: Long): Bot = BotImpl.instanceWhose(qq = qq)
+        fun getInstance(qq: Long): Bot = BotImpl.getInstance(qq = qq)
     }
 
     /**

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotImpl.kt

@@ -60,7 +60,7 @@ abstract class BotImpl<N : BotNetworkHandler> constructor(
             it.get()?.let(block)
         }
 
-        fun instanceWhose(qq: Long): Bot {
+        fun getInstance(qq: Long): Bot {
             instances.forEach {
                 it.get()?.let { bot ->
                     if (bot.uin == qq) {