chg: Improve documentation of MISPAttribute.malware_binary

pymisp/mispevent.py

@@ -309,9 +309,9 @@ class MISPAttribute(AbstractMISP):
 
     @property
     def malware_binary(self) -> Optional[BytesIO]:
-        """Returns a BytesIO of the malware (if the attribute has one, obvs).
-        Note: The first call may be slow as it will decrypt the sample and this
-        operation can be very slow, especially if the malware sample is big (~1s/MB).
+        """Returns a BytesIO of the malware, if the attribute has one.
+        Decrypts, unpacks and caches the binary on the first invocation,
+        which may require some time for large attachments (~1s/MB).
         """
         if self.type != 'malware-sample':
             # Not a malware sample