fix(plugins): Add period to end of first paragraph (#2699)

Author: mi4l

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

@@ -17,7 +17,7 @@ related:
     url: https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366
 ---
 
-Originally, chunks (and modules imported inside them) were connected by a parent-child relationship in the internal webpack graph. The `CommonsChunkPlugin` was used to avoid duplicated dependencies across them, but further optimizations were not possible
+Originally, chunks (and modules imported inside them) were connected by a parent-child relationship in the internal webpack graph. The `CommonsChunkPlugin` was used to avoid duplicated dependencies across them, but further optimizations were not possible.
 
 Since webpack v4, the `CommonsChunkPlugin` was removed in favor of `optimization.splitChunks`.