fix(docs): 文档链接 404 (#3034)

Author: visiky

docs/common/marker.en.md

@@ -7,4 +7,4 @@
 _Marker_ The supported tag types are： _circle | square | line | diamond | triangle | triangle-down | hexagon | bowtie | cross | tick | plus | hyphen_；
 _MarkerCallback_ is `(x: number, y: number, r: number) => PathCommand`；
 
-[DEMO](zh/examples/component/legend#legend-marker-customize) of `Customize legend marker`.
+[DEMO](/zh/examples/component/legend#legend-marker-customize) of `Customize legend marker`.

docs/common/marker.zh.md

@@ -14,6 +14,6 @@
 
 回调的方式为：`(x: number, y: number, r: number) => PathCommand`；
 
-自定义图例 marker [DEMO](zh/examples/component/legend#legend-marker-customize)
+自定义图例 marker [DEMO](/zh/examples/component/legend#legend-marker-customize)
 
 <!--这里可以插入一个代码示例-->