add note on how to invalidate credentials.properties

Using-Jagex-Accounts.md

@@ -6,7 +6,7 @@ If you have converted your account to a Jagex Account and can no longer login di
 2. For Windows, run `RuneLite (configure)` from the start menu. Otherwise, pass `--configure` to the launcher (i.e. `/Applications/RuneLite.app/Contents/MacOS/RuneLite --configure` on Mac).
 3. In the `Client arguments` input box add `--insecure-write-credentials`
 4. Click Save
-5. Launch RuneLite via the Jagex launcher. RuneLite will write your launcher credentials to `.runelite/credentials.properties`. **Do not share this file with anyone.**
+5. Launch RuneLite via the Jagex launcher. RuneLite will write your launcher credentials to `.runelite/credentials.properties`. These credentials can be used to login into your account directly, bypassing your password. **Do not share this file with anyone.**
 6. Launch RuneLite client (eg. via the IDE) and it will use the saved credentials.
 
-Once you've finished development you can delete the `credentials.properties` file to return your Runelite back to normal.
+Once you've finished development you can delete the `credentials.properties` file to return your Runelite back to normal. If for any reason you need to invalidate the credentials, you can use the "End sessions" button under account settings on runescape.com.