message: fix: typo in download button classname (thanks
diff: <div class="api-info-wrapper">
  <h1>{{info.title}} <span class="api-info-version">({{info.version}})</span></h1>
  - <p class="donwload-openapi" *ngIf="specUrl">
  + <p class="download-openapi" *ngIf="specUrl">
  Download OpenAPI (fka Swagger) specification:
  <a class="openapi-button" target="_blank" attr.href='{{specUrl}}'> Download </a>
  </p>
  