Update CODEOWNERS (Azure#12024)

ruowan · DeMale · commit 3bd227381a4c · 2020-12-11T11:53:02.000-08:00
all readme file change request code-gen team review.
diff --git a/CODEOWNERS b/CODEOWNERS
@@ -78,3 +78,4 @@
 /specification/trafficmanager/ @allencal @hrkulkarmsft
 /specification/web/ @naveedaz @Azure/azure-app-service-control-plane
 /profile/ @shahabhijeet
+/specification/**/*.md @lirenhe
