Docs: Fix popover template role error (#38978)

I'm quite sure this should be `role="tooltip"` and not `role="popover"`.  There isn't a popover role but there is a tooltip one.(https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/tooltip_role).. and Bootstrap 5 itself uses role="tooltip" for its popovers by default.

site/content/docs/5.3/components/popovers.md

@@ -198,7 +198,7 @@ Note that for security reasons the `sanitize`, `sanitizeFn`, and `allowList` opt
 | `sanitize` | boolean | `true` | Enable or disable the sanitization. If activated `'template'`, `'content'` and `'title'` options will be sanitized. |
 | `sanitizeFn` | null, function | `null` | Here you can supply your own sanitize function. This can be useful if you prefer to use a dedicated library to perform sanitization. |
 | `selector` | string, false | `false` | If a selector is provided, popover objects will be delegated to the specified targets. In practice, this is used to also apply popovers to dynamically added DOM elements (`jQuery.on` support). See [this issue]({{< param repo >}}/issues/4215) and [an informative example](https://codepen.io/Johann-S/pen/djJYPb). **Note**: `title` attribute must not be used as a selector. |
-| `template` | string | `'<div class="popover" role="popover"><div class="popover-arrow"></div><div class="popover-inner"></div></div>'` | Base HTML to use when creating the popover. The popover's `title` will be injected into the `.popover-inner`. `.popover-arrow` will become the popover's arrow. The outermost wrapper element should have the `.popover` class and `role="popover"`. |
+| `template` | string | `'<div class="popover" role="tooltip"><div class="popover-arrow"></div><div class="popover-inner"></div></div>'` | Base HTML to use when creating the popover. The popover's `title` will be injected into the `.popover-inner`. `.popover-arrow` will become the popover's arrow. The outermost wrapper element should have the `.popover` class and `role="tooltip"`. |
 | `title` | string, element, function | `''` | The popover title. If a function is given, it will be called with its `this` reference set to the element that the popover is attached to. |
 | `trigger` | string | `'hover focus'` | How popover is triggered: click, hover, focus, manual. You may pass multiple triggers; separate them with a space. `'manual'` indicates that the popover will be triggered programmatically via the `.popover('show')`, `.popover('hide')` and `.popover('toggle')` methods; this value cannot be combined with any other trigger. `'hover'` on its own will result in popovers that cannot be triggered via the keyboard, and should only be used if alternative methods for conveying the same information for keyboard users is present. |
 {{< /bs-table >}}