docs: lint fix for samples (#697)

Author: vi3k6i5

docs/samples.rst

@@ -13,12 +13,12 @@ the following two models:
     from django.db import models
     
     class Question(models.Model):
-    question_text = models.CharField(max_length=200)
-    pub_date = models.DateTimeField('date published')
-    def __str__(self):
-        return str(self.rating)
+        question_text = models.CharField(max_length=200)
+        pub_date = models.DateTimeField('date published')
+        def __str__(self):
+            return str(self.rating)
     
     class Choice(models.Model):
-    question = models.ForeignKey(Question, on_delete=models.CASCADE)
-    choice_text = models.CharField(max_length=200)
-    votes = models.IntegerField(default=0)
+        question = models.ForeignKey(Question, on_delete=models.CASCADE)
+        choice_text = models.CharField(max_length=200)
+        votes = models.IntegerField(default=0)