Backport #30090 (#30175)

Add version number to documentation `<title>`

diff --git a/site/_includes/header.html b/site/_includes/header.html
index 8fa50f39544f72a3c5c6eef25881f1b355099d64..985918bd6959d5be6d7d9ad03888e5b8160f5510 100644 (file)
--- a/site/_includes/header.html
+++ b/site/_includes/header.html
@@ -9,7 +9,7 @@
 
 <title>
   {%- if page.title -%}
-    {{ page.title | smartify }} · {{ site.title | smartify }}
+    {{ page.title | smartify }} · {{ site.title | smartify }} v{{ site.docs_version }}
   {%- else -%}
     {{ site.title | smartify }} · {{ site.description | smartify }}
   {%- endif -%}