fix: Edit "You've been nominated" text (ietf-tools#4641) (ietf-tools#5357)

Mention that the schedule is posted to ietf-announce and give a link
to subscribe to that.  Use vague wording to handle all cases.

Also add reminder when to not uncheck the "send automatically" box.

Author: richsalz

ietf/nomcom/migrations/0014_add_uncheck_reminder.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.28 on 2023-03-25 02:52
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('nomcom', '0013_update_accepting_volunteers_helptext'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='nomcom',
+            name='send_questionnaire',
+            field=models.BooleanField(default=False, help_text='If you check this box, questionnaires are sent automatically after nominations. DO NOT CHECK if they are not ready yet.', verbose_name='Send questionnaires automatically'),
+        ),
+    ]

ietf/nomcom/models.py

@@ -48,7 +48,7 @@ class NomCom(models.Model):
 
     group = ForeignKey(Group)
     send_questionnaire = models.BooleanField(verbose_name='Send questionnaires automatically', default=False,
-                                             help_text='If you check this box, questionnaires are sent automatically after nominations.')
+                                             help_text='If you check this box, questionnaires are sent automatically after nominations. DO NOT CHECK if they are not ready yet.')
     reminder_interval = models.PositiveIntegerField(help_text='If the nomcom user sets the interval field then a cron command will '
                                                               'send reminders to the nominees who have not responded using '
                                                               'the following formula: (today - nomination_date) % interval == 0.',