More concise and professional:
* Please find the attached document. (This is more direct and assumes the recipient knows what they're requesting.)
* Attached is the document you requested. (This emphasizes the document's relevance to the recipient's request.)
More specific:
* Please find the [document type] you requested attached. (This provides more context and avoids ambiguity.)
* Attached is the [document type] you requested. (Similar to the above, but with a different structure.)
Adding context:
* As requested, please find the attached [document type]. (This clearly links the document to the recipient's request.)
* I have attached the [document type] you requested. Please let me know if you have any questions. (This is more personal and offers additional support.)
The best option depends on the specific situation and your relationship with the recipient.