docs(plugins) Link split chunks example from the plugin page (#2180)

* docs(plugins) Link split chunks example from the plugin page

* docs(plugins) Fix md formatting in split chunks

Author: EugeneHlushko

src/content/plugins/split-chunks-plugin.md

@@ -7,6 +7,8 @@ contributors:
   - EugeneHlushko
   - byzyk
 related:
+  - title: webpack's automatic deduplication algorthim example
+    url: https://github.com/webpack/webpack/blob/master/examples/many-pages/README.md
   - title: "webpack 4: Code Splitting, chunk graph and the splitChunks optimization"
     url: https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366
 ---