message: docs(styles): add swatch for overlay color [skip release]
diff: @@ -127,6 +127,7 @@ When referring to a color that should be treated as _primary_ (such as a button
  <Swatch colorName="bodyBg" />
  <Swatch colorName="bodyColor" />
  <Swatch colorName="shadow" />
  +<Swatch colorName="overlay" />
  #### Semantic colors
  