Add inlining and code docs

Author: EmandM

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

@@ -1,4 +1,5 @@
 using System;
+using System.Runtime.CompilerServices;
 using UnityEngine;
 
 namespace Unity.Netcode
@@ -336,7 +337,11 @@ public bool CanClientWrite(ulong clientId)
                     return clientId == m_NetworkBehaviour.NetworkObject.OwnerClientId;
             }
         }
-
+        /// <summary>
+        /// Catches if the current <see cref="NetworkManager.LocalClientId"/> is not valid to write to this variable.
+        /// </summary>
+        /// <returns>false if the current <see cref="NetworkManager.LocalClientId"/> can write to this variable, true otherwise</returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal bool LocalClientCannotWrite()
         {
             return m_NetworkManager && !CanClientWrite(m_NetworkManager.LocalClientId);