fix(unity): Use named import for docs in metrics.spec.tsx

Changed from default import  to named import
 to match the export style in unity/index.tsx
and align with all other gettingStartedDocs test files.

Co-authored-by: Armen Zambrano G. <armenzg@users.noreply.github.com>

Author: cursoragent

static/app/gettingStartedDocs/unity/metrics.spec.tsx

@@ -6,7 +6,7 @@ import {textWithMarkupMatcher} from 'sentry-test/utils';
 
 import {ProductSolution} from 'sentry/components/onboarding/gettingStartedDoc/types';
 
-import docs from '.';
+import {docs} from '.';
 
 function renderMockRequests() {
   MockApiClient.addMockResponse({