fix a11y

Author: kyledurand

polaris-react/src/components/Button/Button.stories.tsx

@@ -641,7 +641,11 @@ export function Split() {
           active={active}
           preferredAlignment="right"
           activator={
-            <Button onClick={() => setActive(true)} icon={ChevronDownMinor} />
+            <Button
+              onClick={() => setActive(true)}
+              icon={ChevronDownMinor}
+              accessibilityLabel="Other save actions"
+            />
           }
           autofocusTarget="first-node"
           onClose={() => setActive(false)}

polaris.shopify.com/pages/examples/button-split.tsx

@@ -14,7 +14,11 @@ function ButtonExample() {
           active={active}
           preferredAlignment="right"
           activator={
-            <Button onClick={() => setActive(true)} icon={ChevronDownMinor} />
+            <Button
+              onClick={() => setActive(true)}
+              icon={ChevronDownMinor}
+              accessibilityLabel="Other save actions"
+            />
           }
           autofocusTarget="first-node"
           onClose={() => setActive(false)}