Add default value for warning text icon fallback attribute #3312
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What/Why
Adds the default text 'Warning' to the
iconFallbackText
option for the warning text component.As we're now setting a default value, I've also set this to no longer be a required attribute. I couldn't find any evidence in commit history that there's a risk in setting a default and not setting this as required and we use the word 'Warning' for this value in all our review app examples and our code example on the website, therefore I don't think this change is controversial.
Fixes #2693