chore: fix max-height

Author: liweijie0812

packages/site-components/src/styles/docs.less

@@ -280,8 +280,8 @@ div[name="DESIGN"] {
 .tdesign-toc_container {
   width: 240px;
   padding-right: 10px;
-  min-height: 480px;
-  max-height: ~"min(calc(100vh - 550px), 480px)";
+  max-height: 480px;
+  max-height: ~"min(calc(100vh - 170px), 480px)";
   overflow: hidden auto;
   position: absolute;
   right: 24px;