Update CODEOWNERS (#28339)

* Update CODEOWNERS

* Older pattern did not work

.github/CODEOWNERS

@@ -8,7 +8,8 @@
 /eng/common/                    @dotnet-maestro-bot
 /eng/Versions.props             @dotnet-maestro-bot @dougbu
 /eng/Version.Details.xml        @dotnet-maestro-bot @dougbu
-PublicAPI.Unshipped.txt         @dotnet/aspnet-api-review
+/src/**/PublicAPI.Unshipped.txt @dotnet/aspnet-api-review
+/src/**/PublicAPI.Shipped.txt   @dotnet/aspnet-api-review
 /src/Components/                @SteveSandersonMS @dotnet/aspnet-blazor-eng
 /src/DefaultBuilder/            @tratcher
 /src/Hosting/                   @tratcher