Reword and format mkl_handles comments

src/sparse_blas/backends/mkl_common/mkl_handles.hpp

@@ -21,14 +21,16 @@
 #define _ONEMKL_SRC_SPARSE_BLAS_BACKENDS_MKL_COMMON_MKL_HANDLES_HPP_
 
 // MKLCPU and MKLGPU backends include
-// This include defines its own oneapi::mkl::sparse namespace with some of the types that are used here: matrix_handle_t, index_base, transpose, uplo, diag.
+// This include defines its own oneapi::mkl::sparse namespace with some of the
+// types that are used here: matrix_handle_t, index_base, transpose, uplo, diag.
 #include <oneapi/mkl/spblas.hpp>
 
 #include "sparse_blas/generic_container.hpp"
 
 namespace oneapi::mkl::sparse {
 
-// Complete the definition of incomplete types dense_vector_handle and dense_matrix_handle as there is no conflict with the oneMKL backends.
+// Complete the definition of incomplete types dense_vector_handle and
+// dense_matrix_handle as they don't exist in oneMKL backends yet.
 
 struct dense_vector_handle : public detail::generic_dense_vector_handle<void*> {
  template <typename T>
@@ -62,7 +64,9 @@ namespace oneapi::mkl::sparse::detail {
  * Internal sparse_matrix_handle type for MKL backends.
  * Here \p matrix_handle_t is the type of the backend's handle.
  * The user-facing incomplete type matrix_handle_t must be kept incomplete.
- * Internally matrix_handle_t is reinterpret_cast as oneapi::mkl::sparse::detail::sparse_matrix_handle which holds another matrix_handle_t for the backend handle.
+ * Internally matrix_handle_t is reinterpret_cast as
+ * oneapi::mkl::sparse::detail::sparse_matrix_handle which holds another
+ * matrix_handle_t for the backend handle.
  */
 using sparse_matrix_handle = detail::generic_sparse_handle<matrix_handle_t>;