[1.10.x] Fixed #26806 -- Triple quoted docstrings in docs/ref/forms/validation.txt.

Backport of 2032bcf182 from master

docs/ref/forms/validation.txt

@@ -263,19 +263,16 @@ containing comma-separated email addresses. The full class looks like this::
 
     class MultiEmailField(forms.Field):
         def to_python(self, value):
-            "Normalize data to a list of strings."
-
+            """Normalize data to a list of strings."""
             # Return an empty list if no input was given.
             if not value:
                 return []
             return value.split(',')
 
         def validate(self, value):
-            "Check if value consists only of valid emails."
-
+            """Check if value consists only of valid emails."""
             # Use the parent's handling of required fields, etc.
             super(MultiEmailField, self).validate(value)
-
             for email in value:
                 validate_email(email)