PSR2.ControlStructures.SwitchDeclaration.WrongOpenercase with colon and bracket is unclear

[othercorey]

Describe the bug

The error message is unclear when a switch case begins with : and {:

CASE statements must be defined using a colon (PSR2.ControlStructures.SwitchDeclaration.WrongOpenercase)

Code sample

switch ($type) {
  case 'bool':
  {
    break;
  }
}

Expected behavior

Expect the error message to explain the case cannot include bracket scope after the colon not just that it needs a colon.

Versions (please complete the following information)

PHP version	8.3
PHP_CodeSniffer version	4.0.1
Standard	PSR2
Install type	composer

Additional context

Add any other context about the problem here.

Please confirm

• I have searched the issue list and am not opening a duplicate issue.
• I have read the Contribution Guidelines and this is not a support question.
• I confirm that this bug is a bug in PHP_CodeSniffer and not in one of the external standards.
• I have verified the issue still exists in the 4.x branch of PHP_CodeSniffer.

[jrfnl]

The error message was last changed in 2015: squizlabs/PHP_CodeSniffer@931842a

@othercorey If you have an idea on how to improve the message, while staying in line with PSR2, I look forward to a PR.