Clarify Unity WebGL token guard

Author: clockwork-labs-bot

docs/docs/00100-intro/00300-tutorials/00300-unity-tutorial/00300-part-2.md

@@ -755,6 +755,10 @@ public class GameManager : MonoBehaviour
 #if UNITY_WEBGL && !UNITY_EDITOR
         if (AuthToken.Token == "")
         {
+            // No token was supplied to the connection, so this is the
+            // long-lived server-issued token for the new identity. Save it.
+            // If a token already exists, this connect may have used a
+            // short-lived WebSocket token, which should not overwrite it.
             AuthToken.SaveToken(token);
         }
 #else

docs/docs/00100-intro/00300-tutorials/00300-unity-tutorial/00400-part-3.md

@@ -1367,6 +1367,10 @@ Next lets add some callbacks when rows change in the database. Modify the `Handl
 #if UNITY_WEBGL && !UNITY_EDITOR
         if (AuthToken.Token == "")
         {
+            // No token was supplied to the connection, so this is the
+            // long-lived server-issued token for the new identity. Save it.
+            // If a token already exists, this connect may have used a
+            // short-lived WebSocket token, which should not overwrite it.
             AuthToken.SaveToken(token);
         }
 #else