Added example on how to adjust the validation message for specific form field

[vasilii-b]

Purpose of this pull request

This pull request (PR) add example on how to change validation message for form fields separately using existing validation rules.

Affected DevDocs pages

• https://devdocs.magento.com/guides/v2.3/frontend-dev-guide/validations/custom-validation.html

Links to Magento source code

• https://github.com/magento/magento2/blob/2.3.4/app/code/Magento/CatalogSearch/view/frontend/templates/advanced/form.phtml#L161-L162

whatsnew
Added example for adjusting the form validation message in the Custom validation rules topic.

[devops-devdocs]

An admin must run tests on this PR before it can be merged.

[rogyar]

Hi @vasilii-b. Thank you for the great example. Could I ask you to add an extended explanation of what exactly needs to be done in order to adjust the message for a specific field?

The example below shows how it's done in the core but it does not explain the process explicitly. The question that may appear, do we need to modify the errorPlacement for adjusting the message or it's enough to add the corresponding item into the messages object?

Thank you!

[vasilii-b]

Hi @rogyar,
Thanks for looking into it.
Answering your question - no, the errorPlacement does not affect the modification of the message.
The errorPlacement adjusts where the validation message will show up when the validation rule not passed.

I'll update the file accordingly.
Thank you!

[rogyar]

Awesome, thank you!

[vasilii-b]

Hi @rogyar,
An extended explanation has been added.
Thank you!

[dobooth]

running tests

[ghost]

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[hguthrie]

@dobooth The hand of fate has been dealt. You must add a section for whatsnew or change your labeling strategy.