Fix create_table with multi t columns for Rails/SchemaComment

[nipe0324]

This PR is fix no offenses for Rails/SchemaComment.

# create_table` with multi `t` columns 
create_table :users, comment: 'Table' do |t|
  t.integer :column1 # <- no offenses this line
  t.integer :column2 # <- also no offenses this line
end

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Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.
• If this is a new cop, consider making a corresponding update to the Rails Style Guide.

[koic]

Can you write a new test case without directly editing the existing test case?

[nipe0324]

Ok, I wrote two new test cases.

[koic]

Ditto.

[koic]

@nipe0324 This looks good to me. Can you squash your commits into one?

[nipe0324]

@koic Ok, I have squashed my commits into one.

[koic]

Thanks!