Huh, I've googled that phrase and have been told it's part of the "Summary for Policy Makers" for the IPCC Third Assessment Report (TAR). But when I actually look at the "Summary for Policy Makers", I see either the 0.2/decade increase for that scenario, baldly presented without error bars (see page 11 of the above link) or presented with far larger error bars (0.1 to 0.3 C/decade presented as 1C to 3+ C increase by end of century and the IS92a predicts near linear increase) than your statement suggests. So why do we have a graph with 0.1 to 0.3 C/decade and a written statement with 0.1 to 0.2 C/decade?
Also, let it be noted that IS92a scenario is not a scenario of the the TAR, but of a previous assessment report. Instead, the TAR presents its own scenarios depending on degree of adoption of non-fossil fuel energy technologies and global dependence on high tech industry. These scenarios uniformly predict a higher temperature increase per decade in the near future than IS92a does, even the scenarios that are more conservative in CO2 emissions.
Looks to me like someone took the boring prediction of 0.1 to 0.2 C per decade in the IS92a scenario and sexed it up to 0.1 to 0.3 C per decade for the graphs, forgetting to change the old written prediction. Here, we need more than merely being in line with inflated expectations. We also need someone who isn't consistently exaggerating the expectations.
There's some glaring abuse of charts as well. The chart on page 17, which claims that the effects of CO2 emissions will even in the face of substantial reductions in CO2 emissions from today will remain at elevated levels indefinitely even over the course of a 1,000 years. But there's nothing on the Y axis. It's touchie feelie curve drawing mixed with a huge assumption about how carbon sinking won't work.