[com-fields]Clarify label

[brianteeman]

It was highlighted in Pull Request for Issue #13051 that the field labeled class was not clear. This PR changes it to say edit class

[ggppdk]

It is good, but what about "Render" class ?

please see the popup description: "The class attribute of the field when the field is rendered ..."
almost like sounds like: "The class attribute of the form field, when the form field is rendered ..."

besides, a form field is not "rendered" ? i think it is rendered too

So what about:
Class (viewing)
Class (editing)

[ggppdk]

I have tested this item ✅ successfully on d149b8d

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[jeckodevelopment]

I have tested this item ✅ successfully on d149b8d

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[jeckodevelopment]

RTC

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[brianteeman]

Thanks