Add missing NEWS entries

Misc/NEWS

@@ -40,6 +40,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #11548: shutil.unpack_archive now correctly handles the format
+  parameter. Patch by Evan Dandrea.
+
 - Issue #11133: fix two cases where inspect.getattr_static can trigger code
   execution. Patch by Andreas Stührk.
 
@@ -119,6 +122,9 @@ Tools/Demos
 Tests
 -----
 
+- Issue #11548: Improve test coverage of the shutil module. Patch by
+  Evan Dandrea.
+
 - Issue #11554: Reactivated test_email_codecs.
 
 - Issue #11490: test_subprocess:test_leaking_fds_on_error no longer gives a