rustdoc: consolidate prefers-reduced-motion-gated rulesets

Author: zopsicle

src/librustdoc/html/static/css/rustdoc.css

@@ -1689,12 +1689,6 @@ instead, we check that it's not a "finger" cursor.
 border-right:3px solid var(--target-border-color);
 }
 
-@medianot (prefers-reduced-motion) {
-:target {
-animation:0.65scubic-bezier(0,0,0.1,1.0) 0.1s targetfadein;
-	}
-}
-
 .code-headera.tooltip {
 color: inherit;
 margin-right:15px;
@@ -1718,6 +1712,10 @@ a.tooltip:hover::after {
 }
 
 @medianot (prefers-reduced-motion) {
+:target {
+animation:0.65scubic-bezier(0,0,0.1,1.0) 0.1s targetfadein;
+	}
+
 /* This animation is layered onto the mistake-proofing delay for dismissing
  a hovered tooltip, to ensure it feels responsive even with the delay.
  */