Make enum section clearer
Make enum section clearer

flaviut/nim-by-example,tmm1/nim-by-example,flaviut/nim-by-example,tmm1/nim-by-example,flaviut/nim-by-example,zhjh1209/nim-by-example.github.io,tmm1/nim-by-example,zhjh1209/nim-by-example.github.io,flaviut/nim-by-example,tmm1/nim-by-example