Analyses support the group config since v1.5 (#5846)

resolves #4416


[Preview](https://docs-getdbt-com-git-dbeatty10-patch-2-dbt-labs.vercel.app/reference/resource-configs/group)
(click the "Analyses" tab)

## What are you changing in this pull request and why?

Add a block for analyses to indicate the first version that the `group`
was possible (v1.5).

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.

website/docs/reference/resource-configs/group.md

@@ -190,6 +190,8 @@ select ...
 
 <TabItem value="analyses">
 
+<VersionBlock firstVersion="1.5">
+
 <File name='analyses/<filename>.yml'>
 
 ```yml
@@ -202,6 +204,8 @@ analyses:
 
 </File>
 
+</VersionBlock>
+
 </TabItem>