It looks like bartus11 has mostly answered your question. It is an sccs (Source Code Control System) ID comment. In this case it says that this script is version 1.11 and was last updated on...
This is a standard header found in many shell scripts/config files in Solaris.
1.11 is a version of the file I think. 89/11/29 is a date (1989-11-29). SMI is an acronym for Sun MIcrosystems.