providers/proxy: update phrasing for basic_auth_* attributes

closes #265

passbook/providers/proxy/migrations/0009_auto_20201007_1721.py

@@ -0,0 +1,31 @@
+# Generated by Django 3.1.2 on 2020-10-07 17:21
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("passbook_providers_proxy", "0008_auto_20200930_0810"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="proxyprovider",
+            name="basic_auth_password_attribute",
+            field=models.TextField(
+                blank=True,
+                help_text="User/Group Attribute used for the password part of the HTTP-Basic Header.",
+                verbose_name="HTTP-Basic Password Key",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="proxyprovider",
+            name="basic_auth_user_attribute",
+            field=models.TextField(
+                blank=True,
+                help_text="User/Group Attribute used for the user part of the HTTP-Basic Header. If not set, the user's Email address is used.",
+                verbose_name="HTTP-Basic Username Key",
+            ),
+        ),
+    ]