fix: typo in spacing (#565)

docs/design/spacing/spacing-system.html

@@ -1,7 +1,7 @@
 ---
 layout: page
 title: Spacing
-description: Standardized spacing values helps us create consistent user interfaces (UIs). This consistency makes it easier for customers to scan, browse, and utilize our UIs as we're setting visual rhythmns and expectations that customres can rely upon.
+description: Standardized spacing values help us create consistent user interfaces (UIs). This consistency makes it easier for customers to scan, browse, and utilize our UIs as we're setting visual rhythms and expectations that customers can rely upon.
 ---
 <section class="d-stack16">
   {% header "h2", "Overview" %}