Pull request template format not correct

[mxsm]

The issue tracker is ONLY used for bug report and feature request.

Any question or RocketMQ proposal please use our mailing lists.

BUG REPORT

1. Please describe the issue you observed:

pull request template format not correct. the corrent format as shown below

FEATURE REQUEST

1. Please describe the feature you are requesting.

2. Provide any additional detail on your proposed use case for this feature.

3. Indicate the importance of this issue to you (blocker, must-have, should-have, nice-to-have). Are you currently using any workarounds to address this issue?