Merge pull request #29288 from abhishek-gola:doc_v3

Documentation fixes, Added How to use pre-built opencv doc #29288

closes: https://github.com/opencv/opencv/issues/29263

co-authored by: @kirtijindal14 @Akansha-977 
### 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
- [ ] 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.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/java/generator/gen_java.py

@@ -1360,7 +1360,9 @@ def sanitize_java_documentation_string(doc, type):
         .replace("@param[in]", "@param") \
         .replace("@param[out]", "@param") \
         .replace("@ref", "REF:") \
+        .replace("@remarks", "<b>Remarks:</b>") \
         .replace("@returns", "@return") \
+        .replace("@retval", "<b>Returns:</b>") \
         .replace("@sa", "SEE:") \
         .replace("@see", "SEE:") \
         .replace("@snippet", "SNIPPET:") \