Steps to reproduce (assumes ChromeVox or similar)

1. Open https://elastic.github.io/eui/#/guidelines/buttons in a new tab.
2. Tab through the navigation to the main content pane. The "ghost" Show Component Code button is first selected.

Actual Result

"Show component code" tab "Show Component Code"

Expected Result

"Show component code"

Suggested Fix
Remove the offending markup that causes this element to be read twice.

Category: #688: Elastic UI Buttons Accessibility
Relevant WCAG Criteria: 2.4.4 Link Purpose (In Context)