[SPARK-35140][INFRA] Add error message guidelines to PR template

[karenfeng]

What changes were proposed in this pull request?

Adds a link to the error message guidelines to the PR template to increase visibility.

Why are the changes needed?

Increases visibility of the error message guidelines, which are otherwise hidden in the Contributing guidelines.

Does this PR introduce any user-facing change?

No

How was this patch tested?

Not needed.

[SparkQA]

Kubernetes integration test unable to build dist.

exiting with code: 1
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/42180/

[SparkQA]

Test build #137651 has finished for PR 32241 at commit 6ef95ac.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/42190/

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/42190/

[dongjoon-hyun]

Hi, @karenfeng .

1. Please revise the PR title by following the PR template .
2. Please remove [MINOR] from the PR title. In the PR title and commit title, [MINOR] is used when we don't have a JIRA ID. It's not a copy of JIRA Priority field. We don't use like [SPARK-XXX][MAJOR].
3. In this PR, [INFRA] can be used in your PR title like [SPARK-35140][INFRA].

[karenfeng]

Thanks for the feedback @dongjoon-hyun! I addressed your comments; will keep them in mind next time.

[SparkQA]

Test build #137661 has finished for PR 32241 at commit 5d4bd4a.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

Merged to master.