Add CODEOWNERS for wordpress and nginx

Author: frankfarzan

CODEOWNERS

@@ -1,5 +1,8 @@
 # Docs need to have a single approver to maintain consistency.
 /site @droot @frankfarzan
+# These packages are referenced in docs.
+/package-examples/nginx/ @droot @mortent
+/package-examples/wordpress/ @droot @mortent
 
 # These tests enforce the behavior for fn
 kpt/e2e/testdata/fn-render @droot