The web site you mentioned seems to have version 5 manuals. This is what the DB2 7.2 Command Reference Maunual says:
COMPLETE / STOP
Stops the rolling forward of log records, and completes the rollforward recovery process by rolling back any incomplete transactions and turning off the rollforward pending state of the database. This allows access to the database or table spaces that are being rolled forward. These keywords are equivalent; specify one or the other, but not both. The keyword AND permits specification of multiple operations at once; for example, db2 rollforward db sample to end of logs and complete.
Note: When rolling table spaces forward to a point in time, the table spaces are placed in backup pending state.