[improve][workflow] Add PR guideline info to PR template
<!--
### Contribution Checklist
- - Name the pull request in the form "[Issue XYZ][component] Title of the pull request", where *XYZ* should be replaced by the actual issue number.
- Skip *Issue XYZ* if there is no associated github issue for this pull request.
- Skip *component* if you are unsure about which is the best component. E.g. `[docs] Fix typo in produce method`.
+ - PR title format should be *[type][component] summary*. For details, see *[Guideline - Pulsar PR Naming Convention](https://docs.google.com/document/d/1d8Pw6ZbWk-_pCKdOmdvx9rnhPiyuxwq60_TrD68d7BA/edit#heading=h.trs9rsex3xom)*.
- Fill out the template below to describe the changes contributed by the pull request. That will give reviewers the context they need to do the review.
@@ -68,20 +66,18 @@ This change added tests and can be verified as follows:
### Documentation
-Check the box below or label this PR directly (if you have committer privilege).
+Check the box below or label this PR directly.
Need to update docs?
- [ ] `doc-required`
-
- (If you need help on updating docs, create a doc issue)
+(Your PR needs to update docs and you will update later)
- [ ] `no-need-doc`
-
(Please explain why)
- [ ] `doc`
+(Your PR contains doc changes)
- (If this PR contains doc changes)
-
-
+- [ ] `doc-added`
+(Docs have been already added)
\ No newline at end of file
