[docs] describe version() builtin (ydb-platform#10237)

ydb/docs/en/core/yql/reference/yql-core/builtins/_includes/basic/version.md

@@ -0,0 +1,10 @@
+## Version {#version}
+
+`Version()` returns a string describing the current version of the node processing the request. In some cases, such as during rolling upgrades, it might return different strings depending on which node processes the request. It does not accept any arguments.
+
+### Examples
+
+```yql
+SELECT Version();
+```
+

ydb/docs/en/core/yql/reference/yql-core/builtins/basic.md

@@ -21,6 +21,8 @@
 
 {% include [x](_includes/basic/current_tz.md) %}
 
+{% include [x](_includes/basic/version.md) %}
+
 {% include [x](_includes/basic/max_min.md) %}
 
 {% include [x](_includes/basic/as_container.md) %}

ydb/docs/ru/core/yql/reference/yql-core/builtins/_includes/basic/version.md

@@ -0,0 +1,9 @@
+# Version {#version}
+
+`Version()` возвращает строку, описывающую текущую версию узла, обрабатывающего запрос. В некоторых случаях, например, во время постепенного обновлений кластера, она может возвращать разные строки в зависимости от того, какой узел обрабатывает запрос. Функция не принимает никаких аргументов.
+
+## Примеры
+
+```yql
+SELECT Version();
+```

ydb/docs/ru/core/yql/reference/yql-core/builtins/basic.md

@@ -23,6 +23,8 @@
 
 {% include [x](_includes/basic/current_tz.md) %}
 
+{% include [x](_includes/basic/version.md) %}
+
 {% include [x](_includes/basic/max_min.md) %}
 
 {% include [x](_includes/basic/as_container.md) %}