Docs: clarify content of returned signatures value in openpgp.verify and decrypt

src/message.js

@@ -768,7 +768,7 @@ async function createVerificationObject(signature, literalDataList, verification
  *   keyID: module:type/keyid~KeyID,
  *   signature: Promise<Signature>,
  *   verified: Promise<true>
- * }>>} list of signer's keyID and validity of signatures
+ * }>>} list of signer's keyID and validity of signatures (one entry per signature packet in input)
  * @async
  * @private
  */

src/openpgp.js

@@ -324,6 +324,8 @@ export async function encrypt({ message, encryptionKeys, signingKeys, passwords,
  *         }, ...
  *       ]
  *     }
+ *
+ *     where `signatures` contains a separate entry for each signature packet found in the input message.
  * @async
  * @static
  */
@@ -453,6 +455,8 @@ export async function sign({ message, signingKeys, format = 'armored', detached
  *         }, ...
  *       ]
  *     }
+ *
+ *     where `signatures` contains a separate entry for each signature packet found in the input message.
  * @async
  * @static
  */