Fix some minor errors in IterationCallback docs Change-Id: Id3d7f21a523ff8466868cdec542921c566bbbfa9
Ceres Solver is an open source C++ library for modeling and solving large, complicated optimization problems. It is a feature rich, mature and performant library which has been used in production at Google since 2010. Ceres Solver can solve two kinds of problems.
Please see ceres-solver.org for more information.