Various comment and whitespace cleanups (#39740)

diff --cc TODO
Simple merge

diff --cc src/core/namespace.c
Simple merge

diff --cc test/units/TEST-74-AUX-UTILS.varlinkctl.sh
Simple merge

diff --cc test/units/TEST-75-RESOLVED.sh
index 232180ccf3269340fe5314330e7bfe96f2a54db2,b2dbd2d1b18a9ad477611dcb527a083dad118730..a9504f5d1cfbf5a08cc0fe001f073687d0fb36e0
--- 1/test/units/TEST-75-RESOLVED.sh
--- 2/test/units/TEST-75-RESOLVED.sh
+++ b/test/units/TEST-75-RESOLVED.sh
@@@ -825,10 -825,9 +825,10 @@@ testcase_09_resolvectl_showcache() 
          echo "IPv6AcceptRA=no"
          echo "Address=10.123.0.1/24"
          echo "DNS=10.0.0.1"
-     } > /run/systemd/network/10-dns2.network
+     } >/run/systemd/network/10-dns2.network
      networkctl reload
      networkctl reconfigure dns2
 +    /usr/lib/systemd/systemd-networkd-wait-online --timeout=60 --dns --interface=dns2
  
      mkdir -p /run/systemd/resolved.conf.d/
      {