Ignore varargin in documentation and builtin

[ssordopalacios]

When a function has a varargin input argument, the code analyzer will warn that varargin is not mentioned in the documentation and shadows a built-in.

It seems to me that because of the special nature of varargin, it should not have to appear in the documentation and that by construction it would shadow the built-in.

[bastibe]

Thank you for finding this bug!

Would you like create a pull request that fixes it?

[ssordopalacios]

I'll make the changes soon and create the pull request.

[bastibe]

Thank you! I'll look forward to it.