Fix 'confirmation' example.

[AMS777]

Changes proposed:

• Fix minor copy-paste error on documentation.

Tasks:

• Added test case(s)
• Updated documentation

[offirgolan]

Thanks for the fix @AMS777!

[AMS777]

Thanks @offirgolan!

[offirgolan]

@AMS777 now that I look at it, the original example was correct. See the demo page validations:

email: {
      validators: [
        validator('presence', true),
        validator('format', {
          type: 'email'
        })
      ]
    },
    emailConfirmation: validator('confirmation', {
      on: 'email',
      message: 'Email addresses do not match'
    }),