docs(reference): broken link on `SomeHelp` namespace

[BrainCrumbz]

Hi
going through library documentation: well done, compliments!

There seems to be a broken link on SomeHelp namespace, pointing to https://louthy.github.io/languageext.core/LanguageExt/SomeHelp/index.htm which currently returns 404. Here's a screenshot of the mentioned link.

HTH