Merge pull request #6439 from hashicorp/f-docs-clarify-job-gc-interval

clarify version for new gc config in server stanza

website/source/docs/configuration/server.html.md

@@ -83,7 +83,8 @@ server {
   frequent but smaller collections. Raising the interval will perform collections
   less frequently but collect more jobs at a time. Reducing this interval is
   useful if there is a large throughput of tasks, leading to a large set of
-  dead jobs. This is specified using a label suffix like "30s" or "3m". 
+  dead jobs. This is specified using a label suffix like "30s" or "3m". `job_gc_interval`
+  was introduced in Nomad 0.10.0.
 
 - `job_gc_threshold` `(string: "4h")` - Specifies the minimum time a job must be
   in the terminal state before it is eligible for garbage collection. This is