Merge pull request #25141 from Kumataro:fix25140_4.x

calib3d: doc: remove C API link (For 4.x) #25141

Related to #25140 (for 4.x)

### Pull Request Readiness Checklist

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- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/calib3d/include/opencv2/calib3d.hpp

@@ -433,8 +433,6 @@ R & t \\
     Summary:
     Generic camera model @cite Kannala2006 with perspective projection and without distortion correction
 
-    @defgroup calib3d_c C API
-
   @}
  */