docs: improve code of conduct reference link formatting

Signed-off-by: Bhuvan Somisetty <somisettybhuvan5@gmail.com>

Author: bhuvan-somisetty

docs/sdk_developers/code_of_conduct.md

@@ -1,39 +1,47 @@
 # Code of Conduct
 
 ## Overview
+
 This document outlines the expected behavior for contributors to the Python SDK.
 We aim to maintain a respectful, inclusive, and collaborative community.
 
 ## Our Standards
 
 ### Positive Behavior
+
 - Be respectful and considerate in communication
 - Provide constructive and professional feedback
 - Collaborate openly and help others learn
 - Stay focused on improving the project and community
 
 ### Unacceptable Behavior
+
 - Harassment, discrimination, or offensive language
 - Personal attacks, trolling, or hostile behavior
 - Spamming or posting irrelevant content
 - Repeatedly ignoring maintainer guidance or contribution rules
 
 ## Contribution Guidelines
-- Follow project contribution and signing requirements
+
+- Follow the project contribution workflow in `CONTRIBUTING.md`
+- Sign commits using both GPG and DCO (see Quickstart Signing in `CONTRIBUTING.md`)
 - Use clear, respectful language in issues and pull requests
 - Respond to feedback constructively
 - Do not take on more issues than you can reasonably handle
 
 ## Communication
+
 - Keep discussions relevant and productive
 - Ask questions when unsure
 - Be open to suggestions and improvements
 
 ## Enforcement
+
 Maintainers may take action in response to behavior that violates this code, including:
 - Warning contributors
 - Limiting participation
 - Closing or removing contributions where necessary
 
 ## Reference
-For broader community expectations, refer to the Hiero community Code of Conduct if applicable.
+
+For broader community expectations, refer to the [Hiero Community Code of Conduct](https://github.com/hiero-ledger/.github/blob/main/CODE_OF_CONDUCT.md).