changelog entry and a few updates to the new DH params docs (#3718)

diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index 8ea1cf9..93eedbe 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -457,7 +457,7 @@
         .. versionadded:: 2.0
 
         :param bytes data: PEM data to load.
-        :return: A new instance of the appropriate type of encryption
+        :return: A new instance of the appropriate type of asymmetric
             parameters the serialized data contains.
         :raises ValueError: If the data could not be deserialized.
 
@@ -490,7 +490,7 @@
         .. versionadded:: 2.0
 
         :param bytes data: DER data to load.
-        :return: A new instance of the appropriate type of encryption
+        :return: A new instance of the appropriate type of asymmetric
             parameters the serialized data contains.
         :raises ValueError: If the data could not be deserialized.