Add version to the warning headers (#7459) (#7465)

(cherry picked from commit 33bb46c)

Signed-off-by: Fanit Kolchina <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

_layouts/default.html

@@ -165,9 +165,9 @@
         <div id="main-content" class="main-content" role="main">
           {% if page.section == "opensearch" %}
             {% if site.doc_version == "supported" %}            
-              <p class="supported-version-warning">This is an earlier version of the OpenSearch documentation. For the latest version, see the <a href="{{ site.url }}/docs{{ page.url }}">current documentation</a>. For information about OpenSearch version maintenance, see <a href="https://opensearch.org/releases.html">Release Schedule and Maintenance Policy</a>.</p>
+              <p class="supported-version-warning">You're viewing version {{site.opensearch_major_minor_version}} of the OpenSearch documentation. For the latest version, see the <a href="{{ site.url }}/docs{{ page.url }}">current documentation</a>. For information about OpenSearch version maintenance, see <a href="https://opensearch.org/releases.html">Release Schedule and Maintenance Policy</a>.</p>
             {% elsif site.doc_version == "unsupported" %}
-              <p class="unsupported-version-warning">This version of the OpenSearch documentation is no longer maintained. For the latest version, see the <a href="{{ site.url }}/docs{{ page.url }}">current documentation</a>. For information about OpenSearch version maintenance, see <a href="https://opensearch.org/releases.html">Release Schedule and Maintenance Policy</a>.</p>
+              <p class="unsupported-version-warning">You're viewing version {{site.opensearch_major_minor_version}} of the OpenSearch documentation. This version is no longer maintained. For the latest version, see the <a href="{{ site.url }}/docs{{ page.url }}">current documentation</a>. For information about OpenSearch version maintenance, see <a href="https://opensearch.org/releases.html">Release Schedule and Maintenance Policy</a>.</p>
             {% endif %}
           {% endif %}
           {% if site.heading_anchors != false %}