Provider help is missing from PowerShell 5.1
The ProviderHelp section of the System.Management.Automation.dll-help.xml file is missing from PowerShell 5.1 and later versions of PowerShell 5.0., including 5.0.10586.494.
As a result, users can't get help for the core providers (except for the certificate provider, which is in the security file), and help is missing for all of the dynamic parameters that the providers add to the cmdlets.
Also, the Security help file has the provider help section, so Get-Help Certificate works, but even though it has the CmdletHelpPaths section, it is not working (not sure why), so there is no help for the dynamic parameters that the Certificate provider adds to provider cmdlets.
Fixed and validated on 5.1 / Win10. Thanks for the report, please let me know if any issues remain.
June Blender commented
Thanks, Zachary. Get-Help <Provider> works, but custom cmdlet help for providers is failing. I'll file a separate issue.