fix warning and note

20.md

@@ -8,7 +8,8 @@
 
 This NUT defines signature-based authentication for mint quote redemption. When requesting a mint quote, clients provide a public key. The mint will then require a valid signature from the corresponding secret key to process the mint operation.
 
-> [!CAUTION] > [NUT-04][04] mint quotes without a public key can be minted by anyone who knows the mint quote id without providing a signature.
+> [!CAUTION]
+> [NUT-04][04] mint quotes without a public key can be minted by anyone who knows the mint quote id without providing a signature.
 
 ## Mint quote
 
@@ -33,7 +34,8 @@ with the requested `amount`,`unit`, and `description` according to [NUT-04][04].
 
 `pubkey` is the public key that will be required for signature verification during the minting operation. The mint will only mint ecash after receiving a valid signature from the corresponding private key in the subsequent `PostMintRequest`.
 
-> [!IMPORTANT] > **Privacy:** To prevent the mint from being able to link multiple mint quotes, wallets **SHOULD** generate a unique public key for each mint quote request.
+> [!IMPORTANT]
+> **Privacy:** To prevent the mint from being able to link multiple mint quotes, wallets **SHOULD** generate a unique public key for each mint quote request.
 
 The mint `Bob` then responds with a `PostMintQuoteBolt11Response`: