improved casing

Author: maheshwarip

src/content/docs/queues/observability/metrics.mdx

@@ -64,7 +64,7 @@ The `queuesBacklogAdaptiveGroups` dataset provides the following dimensions for
 
 ## Example GraphQL Queries
 
-### Get average Queue backlog over time period
+### Get average queue backlog over time period
 
 ```graphql
 query QueueBacklog($accountTag: string!, $queueId: string!, $datetimeStart: Time!, $datetimeEnd: Time!) {