Add codeowners for documentation (#1061)

* Add codeowners for documentation

* Update CODEOWNERS

---------

Co-authored-by: samjwu <samjwu@users.noreply.github.com>

.github/CODEOWNERS

@@ -1 +1,4 @@
-* @wenkaidu @gilbertlee-amd @akolliasAMD @edgargabriel @PedramAlizadeh @BertanDogancay @nusislam @nileshnegi @KawtharShafie @AtlantaPepsi @mberenjk @haripriya-amd
+* @wenkaidu @gilbertlee-amd @akolliasAMD @edgargabriel @PedramAlizadeh @BertanDogancay @nusislam @nileshnegi @KawtharShafie @AtlantaPepsi @mberenjk @haripriya-amd# Documentation files
+docs/* @ROCm/rocm-documentation
+*.md @ROCm/rocm-documentation
+*.rst @ROCm/rocm-documentation