f7cba0549073a6eb2eb7937c19c2a94a640ffb38
Added a section explaining the limitations of the `ValidatePdfAAsync` method, highlighting that it performs heuristic PDF/A detection rather than full ISO-19005 compliance checks. Listed specific requirements not validated and clarified the meaning of `IsValid = true`. Updated the API endpoint table to reflect the heuristic nature of the `ValidatePdfAAsync()` method.
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