Documentation: Adding return statement to process_form_submission (#10143)

* Adding missing return statement to FormPage.process_form_submission in the "Custom form submission model" example to make it available to FormPage.render_landing_page, among other methods.

CONTRIBUTORS.rst

@@ -694,6 +694,7 @@ Contributors
 * Julian Bigler
 * Kenny Wolf
 * Himanshu Garg
+* Christopher Wardle
 
 Translators
 ===========

docs/reference/contrib/forms/customisation.md

@@ -93,7 +93,7 @@ class FormPage(AbstractEmailForm):
         return CustomFormSubmission
 
     def process_form_submission(self, form):
-        self.get_submission_class().objects.create(
+        return self.get_submission_class().objects.create(
             form_data=form.cleaned_data,
             page=self, user=form.user
         )
@@ -160,7 +160,7 @@ class FormPage(AbstractEmailForm):
         return CustomFormSubmission
 
     def process_form_submission(self, form):
-        self.get_submission_class().objects.create(
+        return self.get_submission_class().objects.create(
             form_data=form.cleaned_data,
             page=self, user=form.user
         )
@@ -235,7 +235,7 @@ class FormPage(AbstractEmailForm):
         return CustomFormSubmission
 
     def process_form_submission(self, form):
-        self.get_submission_class().objects.create(
+        return self.get_submission_class().objects.create(
             form_data=form.cleaned_data,
             page=self, user=form.user
         )