assert.YAMLEq: Document mutlidoc behavior #1791
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Summary
Document the limitation that YAMLEq only compares the first document.
Changes
Motivation
It would be preferable to fix YAMLEq to compare all documents because that's what it outwardly claims to do and is what one would expect it to do. #1284 would do that, but #1579 as made this practically impossible. So in testify v1 we must document the behavior as is.
Related issues
Addresses but does not resolve #1281