Merge branch 'patch-1' into 'master'

Update mkdocs.yml

See merge request extensions/form-processor!11

mkdocs.yml

@@ -8,7 +8,8 @@ nav:
 - Requirements: requirements.md
 - Basic Concept: basic-concept.md
 - How to make your own:
-  - Sign Up for Newsletter: sign-up-newsletter.md
+  - Sign Up for Newsletter (Drupal): sign-up-newsletter.md
+  - Sign Up for Newsletter (WordPress): sign-up-newsletter-wordpress.md
   - Your Email Preferences: email-preferences.md
 
 markdown_extensions: