yes, the commands are looking good. Minimum requirement is Solaris Cluster 3.2u3 to use hybrid I/O. But I guess you running 3.3 or 4.1 anyway.
The mode=sc is a requirement on the vsw for Solaris Cluster interconnect (private network).
And it is supported to add mode=hybrid to guest LDom for the Solaris Cluster interconnect.
There is no special documentation for Solaris Cluster because its using what is available in the
Oracle VM Server for SPARC 3.1 Administration Guide