DOC Update model validation docs

silverstripe / developer-docs

Developer documentation for Silverstripe CMS

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Closed emteknetnz closed 2 months ago

emteknetnz commented 4 months ago

swapped the order of "Model Validation" and "Contraints" to match the page title, and also because it's a more logical order IMO
Added an addFieldError() example which I think is the most common use case for using model validation
Updated h1 to match page title

GuySartorelli commented 3 months ago

linting failure

emteknetnz commented 3 months ago

Updated