Correct typo and Unify code style

[heli-os]

Motivation:

• Found some typos when running the tests.
• Wanted to improve the example.

Modifications:

• correct typo in some files
  • Test files
  • Released Method's Parameter name
  • PR Template, typo is being applied in this conversation 🙂
• modifications to unify code style
  • In the test code, sut is using private but it's not private in JpaCriteriaQueryBuilderTest
  • Remove one trailing commas
• change example code to not use platform type
  Platform type requires unnecessary boilerplate(!!, let trick, ...)
  I think it should be best practice because many people can copy & paste that. Please review.

Result:

There is no change that users can feel.

[CLAassistant]

All committers have signed the CLA.

[shouwn]

Thank you for your help!