Merge pull request #3555 from Jack-Chan-2001:4.x

Fix typing error

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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
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      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

Author: Jack-Chan-2001

modules/ccalib/src/omnidir.cpp

@@ -2138,7 +2138,7 @@ void cv::omnidir::internal::flags2idxStereo(int flags, std::vector<int>& idx, in
     }
 }
 
-// fill in zerso for fixed parameters
+// fill in zeros for fixed parameters
 void cv::omnidir::internal::fillFixed(Mat&G, int flags, int n)
 {
     Mat tmp = G.clone();