[CODEOWNERS] Add code owners for DPC++ tools

Assign code owners for file-table-tform, llvm-foreach and
llvm-no-spir-kernel tools.

Add more comments and co-locate related components.

Author: bader

.github/CODEOWNERS

@@ -1,18 +1,27 @@
 * @bader
 
+# Front-ent compiler
 clang/ @Fznamznon @premanandrao @elizabethandrews
 
+# Driver
 clang/**/Driver @mdtoguchi @AGindinson
 
+# LLVM-SPIRV translator
 llvm-spirv/ @AlexeySotkin @AlexeySachkov
 
+# OpenCL "offline" compiler
 opencl-aot/ @dm-vodopyanov @AlexeySachkov @romanovvlad
 
+# Device library
 libdevice/ @vzakhari
 
-sycl/ @intel/llvm-reviewers-runtime
-
+# Documentation
 sycl/ReleaseNotes.md @pvchupin
+sycl/doc/ @pvchupin @kbobrovs
+sycl/doc/extensions/ @intel/dpcpp-specification-reviewers
+
+# DPC++ runtime library
+sycl/ @intel/llvm-reviewers-runtime
 
 # USM
 sycl/include/CL/sycl/detail/clusm.hpp @jbrodman
@@ -41,6 +50,9 @@ sycl/source/detail/plugin.hpp @smaslov-intel
 sycl/source/detail/posix_pi.cpp @smaslov-intel
 sycl/source/detail/windows_pi.cpp @smaslov-intel
 
+# CUDA plugin
+sycl/plugins/cuda/ @intel/llvm-reviewers-cuda
+
 # Stream
 sycl/include/CL/sycl/detail/stream_impl.hpp @againull
 sycl/include/CL/sycl/stream.hpp @againull
@@ -78,16 +90,16 @@ sycl/source/half_type.cpp @AlexeySachkov
 sycl/include/CL/sycl/swizzles.def @turinevgeny
 sycl/include/CL/sycl/types.hpp @turinevgeny
 
-sycl/plugins/cuda/ @intel/llvm-reviewers-cuda
-
-sycl/doc/ @pvchupin @kbobrovs
-
-sycl/doc/extensions/ @intel/dpcpp-specification-reviewers
-
+# XPTI instrumentation utilities
 xpti/ @tovinkere @andykaylor
 xptifw/ @tovinkere  @andykaylor
 
+# DPC++ tools
+llvm/tools/file-table-tform/ @kbobrovs @AlexeySachkov
+llvm/tools/llvm-foreach/ @Fznamznon @AlexeySachkov
+llvm/tools/llvm-no-spir-kernel/ @AGindinson @AlexeySachkov
 llvm/tools/sycl-post-link/ @kbobrovs @AlexeySachkov
 
+# Clang offload tools
 clang/tools/clang-offload-bundler/ @kbobrovs @sndmitriev
 clang/tools/clang-offload-wrapper/ @sndmitriev @kbobrovs