Merge pull request #26152 from sturkmen72:m_buf_supported

Documentation update for imagecodecs #26152

### 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.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/imgcodecs/src/bitstrm.cpp

@@ -1,44 +1,6 @@
-/*M///////////////////////////////////////////////////////////////////////////////////////
-//
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+// This file is part of OpenCV project.
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 #include "precomp.hpp"
 #include "bitstrm.hpp"
@@ -49,11 +11,6 @@ namespace cv
 
 const int BS_DEF_BLOCK_SIZE = 1<<15;
 
-bool  bsIsBigEndian( void )
-{
-    return (((const int*)"\0\x1\x2\x3\x4\x5\x6\x7")[0] & 255) != 0;
-}
-
 /////////////////////////  RBaseStream ////////////////////////////
 
 bool  RBaseStream::isOpened()