Update pull_request_template.md

[wey-gu]

Previously （ and ： were included as follow, this pr fixed them.

Removed some Chinese punctuation characters.

#### What type of PR is this?
- [ ] bug
- [ ] feature
- [ ] enhancement

#### What does this PR do?


#### Which issue(s)/PR(s) this PR relates to?

  
#### Special notes for your reviewer, ex. impact of this fix, etc:


#### Additional context:


#### Checklist：
- [ ] Documentation affected （Please add the label if documentation needs to be modified.)
- [ ] Incompatible （If it is incompatible, please describe it and add corresponding label.）
- [ ] Need to cherry-pick （If need to cherry-pick to some branches, please label the destination version(s).)
- [ ] Performance impacted: Consumes more CPU/Memory


#### Release notes：
Please confirm whether to reflect in release notes and how to describe:
>                                                                 `