style

Adding comments for clarity of what `OnSpawned` and the call to `PostNetworkVariableWrite` is for.
Removing trailing whitespaces.

Author: NoelStephensUnity

com.unity.netcode.gameobjects/Runtime/NetworkVariable/NetworkVariable.cs

@@ -408,8 +408,13 @@ internal override void WriteFieldSynchronization(FastBufferWriter writer)
             }
         }
 
+        /// <summary>
+        /// Notification we have fully spawned the associated <see cref="NetworkObject"/>.
+        /// </summary>
         internal override void OnSpawned()
         {
+            // Assure any changes made to any NetworkVariable during spawn or post-spawn are
+            // serialized with the CreateObjectMessage.
             m_NetworkBehaviour.PostNetworkVariableWrite(true);
             base.OnSpawned();
         }

com.unity.netcode.gameobjects/Tests/Runtime/NetworkVariable/NetworkVariableGeneralTests.cs

@@ -49,7 +49,7 @@ public override void OnNetworkSpawn()
                 }
                 else
                 {
-                    // Only set these values during OnNetworkSpawn to 
+                    // Only set these values during OnNetworkSpawn to
                     // verify this value is valid for non-authority instances.
                     OnNetworkSpawnValue = TestValueOnSpawn.Value;
                     OnNetworkPostSpawnValue = TestValueOnPostSpawn.Value;