Set helix style to only wrap if long for throws.

[huizhilu]

Issues

• My PR addresses the following Helix issues and references them in the PR description:

Fixes #633

Description

• Here are some details about my PR, including screenshots of any UI changes:

Currently throws key word is wrapped to next line. We want it to be wrapped if long.

Tests

• The following tests are written for this issue:

(List the names of added unit/integration tests)

• The following is the result of the "mvn test" command on the appropriate module:

(Copy & paste the result of "mvn test")

Commits

• My commits all reference appropriate Apache Helix GitHub issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation in the following wiki page:

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Code Quality

• My diff has been formatted using helix-style.xml

[jiajunwang]

@pkuwm Please confirm if we can merge this change by following the required submit steps.

[huizhilu]

This PR is ready to be merged, approved by @narendly
Message:

Currently key word throws is always wrapped to next line. This commit makes it only wrapped if long.