Fix 'page 1' special treatment in pagination docs (#8230)

Merge pull request 8230

docs/_docs/pagination.md

@@ -154,7 +154,7 @@ page with links to all but the current page.
     {% if page == paginator.page %}
       <em>{{ page }}</em>
     {% elsif page == 1 %}
-      <a href="{{ paginator.previous_page_path | relative_url }}">{{ page }}</a>
+      <a href="{{ '/' | relative_url }}">{{ page }}</a>
     {% else %}
       <a href="{{ site.paginate_path | relative_url | replace: ':num', page }}">{{ page }}</a>
     {% endif %}