Updates summary, checklist, adds reviewers, timeline, and notes

Author: KOTungseth

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,20 +4,9 @@ Use this template to help us efficiently review your contribution.
 -->
 ## Summary
 
-Briefly describe what your PR changes or improves.  
-If your contribution fixes an issue, please link it here.
-
-### Checklist
-
-Before you submit your PR, please confirm the following:
-
-- [ ] My changes are clear, accurate, and technically correct.
-- [ ] I verified the Markdown renders correctly.
-- [ ] I avoided duplicating existing content.
-- [ ] I made the changes in the correct section or file.
-- [ ] I followed the style and structure of the surrounding documentation.
-
-To learn more, check [Contribute to Elastic documentation](https://www.elastic.co/docs/contribute-docs). 
+Describe what your PR changes or improves.  
+Describe the reason you are making this change. 
+If your PR fixes an issue, link it here.
 
 ## Generative AI disclosure
 
@@ -29,4 +18,35 @@ To help us ensure compliance with the Elastic open source and documentation guid
 
 2. If you answered "Yes" to the previous question, please specify the tool(s) and model(s) used (e.g., Google Gemini, OpenAI ChatGPT-4, etc.).
 
-Tool(s) and model(s) used:
+Tool(s) and model(s) used:
+
+---
+
+## Checklist
+
+Before requesting a review, please confirm the following:
+
+- [ ] PR follows the [Elastic Docs contribution guidelines](https://www.elastic.co/docs/contribute-docs)  
+- [ ] Content has been proofread for grammar, spelling, and clarity  
+- [ ] Any code examples have been tested and verified  
+- [ ] Images, screenshots, or diagrams included where necessary  
+- [ ] Links and references are correct and functioning  
+
+--
+
+## Reviewers and timeline
+
+To identify the reviewers and expected timelines for your PR, use the table.  
+
+If you plan to review the content within the review timeline, check the box next to your name.
+
+| Role | Reviewer | Review timeline |
+|------|---------|------------------------|
+| Technical review | @username [ ] | Date |
+| Writer review | @username [ ] | Date |
+
+--
+
+## Additional notes
+
+Add any additional context or information for reviewers here.