Update PR description with merge queue information (#10533)

Update PR description for merge queues

Merge branch 'master' into sarahchen6/update-pr-description

Address PR comments

Co-authored-by: sarah.chen <sarah.chen@datadoghq.com>

Author: sarahchen6

.github/pull_request_template.md

@@ -6,15 +6,17 @@
 
 # Contributor Checklist
 
-- Format the title [according the contribution guidelines](https://github.com/DataDog/dd-trace-java/blob/master/CONTRIBUTING.md#title-format)
-- Assign the `type:` and (`comp:` or `inst:`) labels in addition to [any useful labels](https://github.com/DataDog/dd-trace-java/blob/master/CONTRIBUTING.md#labels)
-- Don't use `close`, `fix` or any [linking keywords](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword) when referencing an issue.  
+- Format the title according to [the contribution guidelines](https://github.com/DataDog/dd-trace-java/blob/master/CONTRIBUTING.md#title-format)
+- Assign the `type:` and (`comp:` or `inst:`) labels in addition to [any other useful labels](https://github.com/DataDog/dd-trace-java/blob/master/CONTRIBUTING.md#labels)
+- Avoid using `close`, `fix`, or [any linking keywords](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword) when referencing an issue  
   Use `solves` instead, and assign the PR [milestone](https://github.com/DataDog/dd-trace-java/milestones) to the issue
-- Update the [CODEOWNERS](https://github.com/DataDog/dd-trace-java/blob/master/.github/CODEOWNERS) file on source file addition, move, or deletion
-- Update the [public documentation](https://docs.datadoghq.com/tracing/trace_collection/library_config/java/) in case of new configuration flag or behavior
+- Update the [CODEOWNERS](https://github.com/DataDog/dd-trace-java/blob/master/.github/CODEOWNERS) file on source file addition, migration, or deletion
+- Update [public documentation](https://docs.datadoghq.com/tracing/trace_collection/library_config/java/) with any new configuration flags or behaviors
 
 Jira ticket: [PROJ-IDENT]
 
+***Note:*** **Once your PR is ready to merge, add it to the merge queue by commenting `/merge`.** `/merge -c` cancels the queue request. `/merge -f --reason "reason"` skips all merge queue checks; please use this judiciously, as some checks do not run at the PR-level. For more information, see [this doc](https://datadoghq.atlassian.net/wiki/spaces/DEVX/pages/3121612126/MergeQueue).
+
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