[linzch3]

Hi,

Storm tracks work on GitHub Issues now (README was updated in #7936), but DEVELOPER.md still pointed people at JIRA.

I updated it to match current practice:

• Bug and feature reports, and the issue-tracker section, now link to https://github.com/apache/storm/issues
• Beginner issues point at the good first issue label instead of the old JIRA newbie/trivial filters
• PR titles should be short and descriptive; if a PR is tied to an issue, mention it in the description (for example Fixes #123), rather than prefixing STORM-123:
• After a merge, close the linked GitHub issue if GitHub did not already close it

Docs only; no code changes.

What is the purpose of the change

Keep the developer docs in line with the GitHub Issues workflow.

How was the change tested

I read through the updated sections and checked that every JIRA workflow link in DEVELOPER.md is gone. I left historical STORM-XXXX citations in other files alone.

An AI assistant helped draft this change; I reviewed it and take responsibility for it.