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

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [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
-
   @}
  */
 

modules/calib3d/src/calib3d_c_api.h

@@ -51,10 +51,6 @@
 extern "C" {
 #endif
 
-/** @addtogroup calib3d_c
-  @{
-  */
-
 /****************************************************************************************\
 *                      Camera Calibration, Pose Estimation and Stereo                    *
 \****************************************************************************************/
@@ -416,8 +412,6 @@ void cvUndistortPoints( const CvMat* src, CvMat* dst,
                         const CvMat* R CV_DEFAULT(0),
                         const CvMat* P CV_DEFAULT(0));
 
-/** @} calib3d_c */
-
 #ifdef __cplusplus
 } // extern "C"
 #endif