Add aria-describedby

Author: tidy-dev

app/src/ui/lib/git-config-user-form.tsx

@@ -183,6 +183,7 @@ export class GitConfigUserForm extends React.Component<
           disabled={this.props.disabled}
           onValueChanged={this.props.onEmailChanged}
           ariaLabel={ariaLabel}
+          ariaDescribedBy="git-email-not-found-warning-for-screen-readers"
           ariaControls="git-email-not-found-warning-for-screen-readers"
         />
       </Row>