[FLINK-10378] Hide/Comment out contribution guide from PR template

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Component/s: Build System
• Labels: pull-request-available
• Assignee: Zili Chen
• Reporter: Zili Chen
• Created: 20/Sep/18 13:45
• Updated: 28/Feb/19 10:24
• Resolved: 27/Sep/18 13:37

Description

Explicitly comment out contribute guide from PULL_REQUEST_TEMPLATE by <!-- -->.

This is a hint to contributor that such message is as information and would not appear at the final content, as a side effect also reduce the work the a contributor delete such text every time.

Issue Links

• links to: GitHub Pull Request #6722