[Doc] support title anchor (#3845)

package.json

@@ -69,9 +69,9 @@
     "@babel/preset-env": "^7.5.4",
     "@babel/preset-typescript": "^7.3.3",
     "@types/jest": "^24.0.15",
-    "@vant/doc": "^2.3.4",
+    "@vant/doc": "^2.3.6",
     "@vant/eslint-config": "^1.2.0",
-    "@vant/markdown-loader": "^2.0.0",
+    "@vant/markdown-loader": "^2.1.2",
     "@vant/markdown-vetur": "^1.0.0",
     "@vant/touch-emulator": "^1.1.0",
     "@vue/babel-preset-jsx": "^1.0.0",
@@ -103,7 +103,7 @@
     "stylelint": "^10.1.0",
     "stylelint-config-rational-order": "^0.1.2",
     "stylelint-config-standard": "^18.3.0",
-    "stylelint-order": "^3.0.0",
+    "stylelint-order": "^3.0.1",
     "ts-jest": "^24.0.2",
     "typescript": "^3.5.3",
     "uppercamelcase": "^3.0.0",