erp5_wendelin_tutorial_ui_test: Ensure consistent email setup

We have to set the 'email_from_address' property after changing the
MailHost settings. This change was not yet described in the tutorial.

bt5/erp5_wendelin_tutorial_ui_test/PathTemplateItem/test_page_module/test_09_wendelin_HowTo_Enable_User_Regstration.html

@@ -30,6 +30,16 @@
 </details>
 </section>
 
+<section class="screenshot">
+<h1>Update Email Sender</h1>
+<img alt="" src="wendelin-updateEmailSender.screenshot?format="  style="font-size: 13px;" title="" type="image/svg+xml" />
+<details open="">
+<p>Open&nbsp;<code>https://[IPv4]/erp5/manage_propertiesForm</code>&nbsp;and add the fields&nbsp;<i>email_from_name</i>&nbsp;and&nbsp;<i>email_from_address</i>&nbsp;to send emails from a valid sender and reduce the chance of emails being labelled as spam. Click&nbsp;<i>Save changes</i>&nbsp;to continue.</p>
+
+<p><strong>Note</strong>: the sender address must match the SMTP provider you used in the previous slide</p>
+</details>
+</section>
+
 <section class="screenshot">
 <h1>Register</h1>
 <img alt="" src="wendelin-register.user.screenshot?format=" style="font-size: 13px;" title="" type="image/svg+xml" />