Add "no-op refactors" reviews for delegated reviewers

As per discussion, also expand the "NsdManager" exemption to be more generic.

Change-Id: I708f44c8546d6c68db9c8a6763bbf6ebb0340883
Test: m
diff --git a/OWNERS_core_networking_xts b/OWNERS_core_networking_xts
index b24e3ac..9e4e4a1 100644
--- a/OWNERS_core_networking_xts
+++ b/OWNERS_core_networking_xts
@@ -1,11 +1,12 @@
 lorenzo@google.com
 satk@google.com #{LAST_RESORT_SUGGESTION}
 
-# For cherry-picks of CLs that are already merged in aosp/master, or flaky test fixes.
+# For cherry-picks of CLs that are already merged in aosp/master, flaky test
+# fixes, or no-op refactors.
 jchalard@google.com #{LAST_RESORT_SUGGESTION}
-# In addition to cherry-picks and flaky test fixes, also for APF firmware tests
-# (to verify correct behaviour of the wifi APF interpreter)
+# In addition to cherry-picks, flaky test fixes and no-op refactors, also for
+# APF firmware tests (to verify correct behaviour of the wifi APF interpreter)
 maze@google.com #{LAST_RESORT_SUGGESTION}
-# In addition to cherry-picks and flaky test fixes, also for incremental changes on NsdManager tests
-# to increase coverage for existing behavior, and testing of bug fixes in NsdManager
+# In addition to cherry-picks, flaky test fixes and no-op refactors, also for
+# NsdManager tests
 reminv@google.com #{LAST_RESORT_SUGGESTION}