docs: Fix typo at toHaveStyle function description (#558)

Author: gennadiipel

types/matchers.d.ts

@@ -344,7 +344,7 @@ declare namespace matchers {
      * Only matches if the element has *all* the expected properties applied, not just some of them.
      * @example
      * <button
-     *   data-test-id="submit-button"
+     *   data-testid="submit-button"
      *   style="background-color: green; display: none"
      * >
      *   submit