[5.1] Update ConstraintChecker.php typo/spelling

[brianteeman]

Summary of Changes

fixes a typo/spelling error in the code comments

code review only

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[Quy]

I have tested this item ✅ successfully on b3991f2

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[alikon]

I have tested this item ✅ successfully on b3991f2

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43284.}

[alikon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43284.}

[brianteeman]

Thanks @wilsonge

[wilsonge]

Thanks!