docs:删除多余的注释代码

src/modules/teach-tool/components/CourseCategorySiderTree.less

@@ -30,7 +30,7 @@
       text-align: center;
       text-align: center;
       margin-top: 100%;
       margin-top: 100%;
       .empty-tree-btn {
       .empty-tree-btn {
-        color: #2966FF;
+        color: #2966ff;
         cursor: pointer;
         cursor: pointer;
       }
       }
     }
     }
@@ -39,8 +39,6 @@
       font-weight: 400;
       font-weight: 400;
       color: #666666;
       color: #666666;
       width: 234px;
       width: 234px;
-      // overflow-x: scroll;
-      // overflow-y: hidden;
       .anticon {
       .anticon {
         color: #999999;
         color: #999999;
       }
       }
@@ -52,7 +50,7 @@
           white-space: nowrap;
           white-space: nowrap;
         }
         }
         .ant-tree-node-content-wrapper.ant-tree-node-selected {
         .ant-tree-node-content-wrapper.ant-tree-node-selected {
-          color: #2966FF;
+          color: #2966ff;
         }
         }
       }
       }
       .ant-tree-treenode-selected:hover::before,
       .ant-tree-treenode-selected:hover::before,