Vmware recently launched the Beta VMware developers website which provides a repository of all PowerCLI commands available. Visit the website "VMware Developer Documentation".
The screenshot below taken from the website shows a summary of the features of this website:
In the search window, enter the product/feature, for which you need to view the powercli commands available, e.g vSAN. All the valid commands would show up in the search results as shown in the screenshot below:
Click on any of the commands, as per your requirement. The command explanation page opens. This page contains information of the command syntax, accepted parameters and usage examples:
In my opinion this is an awesome and much needed update to VMware's older powercli commands help/repository website. Go ahead and explore commands which would help in your automation requirements!!