Minor fixes to date and selector version (#927)

This PR fixes a date for the pdf and the number when selecting the PG version from the dropdown menu.

Author: Andriciuc

.github/workflows/main.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Deploy docs
         run: |
           mike deploy 16 -b publish -p
-          mike retitle 16 "16.11" -b publish -p
+          mike retitle 16 "16.13" -b publish -p
 
 # - name: Install Node.js 14.x
 #        uses: percona-platform/setup-node@v2

docs/templates/pdf_cover_page.tpl

@@ -7,6 +7,6 @@
 {% if config.site_description %}
 <h1>{{ config.site_description }}</h1>
 {% endif %} 
-<h2>16.13 (February 28, 2026)</h2>
+<h2>16.13 (February 26, 2026)</h2>
 <!--<h3>Percona Technical Documentation Team</h3>-->