docs($theme-default): remove nested sidebar groups warning

Author: meteorlxy

packages/docs/docs/theme/default-theme-config.md

@@ -232,7 +232,7 @@ Sidebar groups are collapsable by default. You can force a group to be always op
 A sidebar group config also supports [sidebarDepth](#nested-header-links) field to override the default sidebar depth (`1`).
 
 ::: tip
-   Nested sidebar group <Badge text="beta"/> is also supported, but the nesting depth should be less than 3, otherwise the console will receive a warning.
+   Nested sidebar group is also supported.
 :::
 
 ### Multiple Sidebars

packages/docs/docs/zh/theme/default-theme-config.md

@@ -230,7 +230,7 @@ module.exports = {
 一个侧边栏的子组配置同时支持 [sidebarDepth](#nested-header-links) 字段用于重写默认显示的侧边栏深度(`1`)。
 
 ::: tip
-  嵌套的侧边栏分组 <Badge text="beta"/> 也是支持的，但嵌套深度应小于 3，否则在控制台会收到警告。
+  嵌套的侧边栏分组也是支持的。
 :::
 
 ### 多个侧边栏