[EuiBreadcrumbs] a11y polish (#4763)

Co-authored-by: cchaos <caroline.horn@elastic.co>
Co-authored-by: Caroline Horn <549577+cchaos@users.noreply.github.com>

Author: 3 people

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Added `markdownFormatProps` prop to `EuiMarkdownEditor` to extend the props passed to the rendered `EuiMarkdownFormat` ([#4663](https://github.com/elastic/eui/pull/4663))
 - Added optional virtualized line rendering to `EuiCodeBlock` ([#4952](https://github.com/elastic/eui/pull/4952))
 - Added `current` as a `status` of `EuiHorizontalStep` ([#4911](https://github.com/elastic/eui/pull/4911))
+- Improved accessibility of `EuiBreadcrumbs` ([#4763](https://github.com/elastic/eui/pull/4763))
 - Exported `onChange` type for `EuiSearchBar` ([#4968](https://github.com/elastic/eui/pull/4968))
 
 **Bug fixes**

src-docs/src/views/breadcrumbs/breadcrumbs.js

@@ -32,6 +32,10 @@ export default () => {
     },
     {
       text: 'Edit',
+      href: '#',
+      onClick: (e) => {
+        e.preventDefault();
+      },
     },
   ];