docs: fix spelling mistake

Co-authored-by: Thales Macedo Garitezi <thalesmg@gmail.com>

apps/emqx_resource/i18n/emqx_resource_schema_i18n.conf

@@ -137,7 +137,7 @@ When disabled the messages are buffered in RAM only."""
 
   inflight_window {
     desc {
-      en: """Query inflight window. When query_mode is set to async, this config has to be et to 1 if messages from the same MQTT client have to be stricktly ordered."""
+      en: """Query inflight window. When query_mode is set to async, this config has to be set to 1 if messages from the same MQTT client have to be strictly ordered."""
       zh: """请求飞行队列窗口大小。当请求模式为异步时，如果需要严格保证来自同一 MQTT 客户端的消息有序，则必须将此值设为 1。"""""
     }
     label {