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Fix calibration tutorial docs, decomposeProjectionMatrix, and convertMaps performance claims #29487 Fixes #25655, #26791, #27277. Three doc fixes: 1. Calibration tutorial: rows/cols swapped, fixed np.mgrid consistency 2. decomposeProjectionMatrix: clarified transVect is camera center in homogeneous coordinates 3. convertMaps: replaced overstated 2x speed claim ### Pull Request Readiness Checklist - [x] I agree to contribute under Apache 2 License - [x] Not based on GPL/incompatible license - [x] PR proposed to proper branch (4.x) - [x] Reference to original bug report and related work - [ ] Accuracy test, performance test, test data: N/A (doc-only) - [x] Feature well documented and sample code buildable