Show documentation on custom rules

[mcgurdan]

I have noticed the new support for Show documentation for pops up as a suggested correction. However, when using custom rules this uses this github repo and results in a 404 (e.g. https://github.com/PowerShell/PSScriptAnalyzer/blob/development/RuleDocumentation/Measure-PascalCase.md). Is it possible to use a custom url for this feature? This would allow us to direct the documentation at our own internal spaces.