Correct example code in Powell's function example.
Correct example code in Powell's function example.

Thanks to Petter Strandmark for pointing this out.

Change-Id: I967632235dccdb481396e94904bb911c9a1efe1e

whuaegeanse/ceres-solver,ikoruk/ceres-solver,jmwalls/ceres-solver-fork,entylop/ceres-solver,timfel/ceres-bin,whuaegeanse/ceres-solver,timfel/ceres-bin,kartikkumar/ceres-solver,stonier/ceres_solver,kartikkumar/ceres-solver,jmwalls/ceres-solver-fork,DougFirErickson/ceres-solver,ikoruk/ceres-solver,DougFirErickson/ceres-solver,entylop/ceres-solver,ysonggit/ceres-solver,ysonggit/ceres-solver,stonier/ceres_solver,whuaegeanse/ceres-solver,timfel/ceres-bin,kartikkumar/ceres-solver,DougFirErickson/ceres-solver,ysonggit/ceres-solver,DougFirErickson/ceres-solver,ikoruk/ceres-solver,stonier/ceres_solver,kartikkumar/ceres-solver,ikoruk/ceres-solver,jmwalls/ceres-solver-fork,stonier/ceres_solver,whuaegeanse/ceres-solver,timfel/ceres-bin,jmwalls/ceres-solver-fork,entylop/ceres-solver,ysonggit/ceres-solver,ikoruk/ceres-solver,entylop/ceres-solver