Spelling.

Author: vshih

docs/customization.md

@@ -6,7 +6,7 @@ The template used for the SwaggerUIRenderer can be customized by overriding
 
 Here are a few basic areas which can be customized:
 
-- `{% block extra_styles %}` Add additional stylsheets
+- `{% block extra_styles %}` Add additional stylesheets
 - `{% block extra_scripts %}` Add additional scripts.
 - `{% block user_context_message %}` Customize the "Hello, user" message (Django session only)
 - `{% block extra_nav %}` Placeholder for additional content in the nav bar.