docs: refactor for displayAllHeaders

Author: ulivz

docs/default-theme-config/README.md

@@ -146,7 +146,7 @@ sidebarDepth: 2
 
 ### Displaying Header Links of All Pages <Badge text="0.11.0+"/>
 
-The sidebar only displays links for headers in the current active page. You can display all header links for every page with `themeConfig.displayAllHeaders: false`:
+The sidebar only displays links for headers in the current active page. You can display all header links for every page with `themeConfig.displayAllHeaders: true`:
 
 ``` js
 module.exports = {

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

@@ -142,7 +142,7 @@ sidebarDepth: 2
 
 ### 显示所有页面的标题链接 <Badge text="0.11.0+"/>
 
-默认情况下，侧边栏只会显示由当前活动页面的标题（headers）组成的链接，你可以设置 `themeConfig.displayAllHeaders` 来显示所有页面的标题链接：
+默认情况下，侧边栏只会显示由当前活动页面的标题（headers）组成的链接，你可以将 `themeConfig.displayAllHeaders` 设置为 `true` 来显示所有页面的标题链接：
 
 ``` js
 module.exports = {