docs(chips): remove deprecation of delete-button-label

- improve documentation for this API

Author: Splaktar

src/components/chips/js/chipsDirective.js

@@ -155,8 +155,11 @@
    * @param {string=} delete-hint A string read by screen readers instructing users that pressing
    *    the delete key will remove the chip. You will want to use this to override the default when
    *    in a non-English locale.
-   * @param {string=} delete-button-label <strong>Deprecated</strong> A label for the delete button.
-   *    Used to be read by screen readers.
+   * @param {string=} delete-button-label Text for the `aria-label` of the button with the
+   *    `md-chip-remove` class. If the chip is an Object, then this will be the only text in the
+   *    label. Otherwise, this is prepended to the string representation of the chip. Defaults to
+   *    "Remove", which would be "Remove Apple" for a chip that contained the string "Apple".
+   *    You will want to use this to override the default when in a non-English locale.
    * @param {string=} md-removed-message Screen readers will announce this message following the
    *    chips contents. The default is `"removed"`. If a chip with the content of "Apple" was
    *    removed, the screen reader would read "Apple removed". You will want to use this to override