Rename `instanceWhose` to `getInstance`

mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/route/AuthRouteModule.kt

@@ -63,7 +63,7 @@ private data class AuthRetDTO(val code: Int, val session: String) : DTO
 private data class BindDTO(override val sessionKey: String, val qq: Long) : VerifyDTO()
 
 private fun getBotOrThrow(qq: Long) = try {
-    Bot.instanceWhose(qq)
+    Bot.getInstance(qq)
 } catch (e: NoSuchElementException) {
     throw NoSuchBotException
 }
\ No newline at end of file

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 instanceWhose(qq: Long): Bot = BotImpl.instanceWhose(qq = qq)
+        fun getInstance(qq: Long): Bot = BotImpl.instanceWhose(qq = qq)
     }
 
     /**