DOCS-119 Update links to PDF (Innovation) (#165)

Update main.html

Author: alina-derkach-oaza

_resource/overrides/main.html

@@ -32,7 +32,7 @@
                        {% include "partials/nav.html" %}
                        <br>
                        <label class="md-nav__title" for="__drawer">
-       <a href="https://learn.percona.com/download-manual-percona-distribution-for-mysql-innovation-release" onclick="_gaq.push(['b._trackEvent', 'Percona Distribution for MySQL', 'Download', 'Download Manual Distribution for MySQL']);" class="md-nav__link md-nav__link--active" style="font-size: .7rem;">
+       <a href="https://learn.percona.com/download-manual-percona-distribution-for-mysql-innovation-releases" onclick="_gaq.push(['b._trackEvent', 'Percona Distribution for MySQL', 'Download', 'Download Manual Distribution for MySQL']);" class="md-nav__link md-nav__link--active" style="font-size: .7rem;">
          Download PDF
        </a>
      </label>