Merge pull request opencv#26537 from artoolkitx:emscripten-build-fixes

Emscripten build fixes opencv#26537

- Corrects typo in Emscripten-only intrinsics header (Fixes opencv#26536)
- Updates deprecated intrinsic title (as per LLVM final intrinsic name).

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

Author: philip-lamb

modules/core/include/opencv2/core/hal/intrin_lasx.hpp

@@ -906,7 +906,7 @@ inline v_uint16x16 v_mul_hi(const v_uint16x16& a, const v_uint16x16& b) { return
     { return _Tpuvec(__lasx_xvsll_##suffix(a.val, __lasx_xvreplgr2vr_##suffix(imm))); }           \
     inline _Tpsvec v_shl(const _Tpsvec& a, int imm)                                               \
     { return _Tpsvec(__lasx_xvsll_##suffix(a.val, __lasx_xvreplgr2vr_##suffix(imm))); }           \
-    inline _Tpuvec V_shr(const _Tpuvec& a, int imm)                                               \
+    inline _Tpuvec v_shr(const _Tpuvec& a, int imm)                                               \
     { return _Tpuvec(__lasx_xvsrl_##suffix(a.val, __lasx_xvreplgr2vr_##suffix(imm))); }           \
     inline _Tpsvec v_shr(const _Tpsvec& a, int imm)                                               \
     { return _Tpsvec(srai(a.val, __lasx_xvreplgr2vr_##suffix(imm))); }                            \