!8725 【轻量级 PR】：update zh-cn/application-dev/windowmanager/application-window-stage.md.

Merge pull request !8725 from 葛亚芳/N/A

zh-cn/application-dev/windowmanager/application-window-stage.md

@@ -351,7 +351,7 @@ class MainAbility extends Ability {
        onWindowStageCreate(windowStage) {
            // 2. 创建悬浮窗。
            var windowClass = null;
-           window.create(this.context, "floatWindow", window.WindowType.TYPE_FlOAT, (err, data) => {
+           window.create(this.context, "floatWindow", window.WindowType.TYPE_FLOAT, (err, data) => {
                if (err.code) {
                    console.error('Failed to create the floatWindow. Cause: ' + JSON.stringify(err));
                    return;