Call out pyzstd explicitly in license description

Co-authored-by: Adam Turner <[email protected]>

Author: emmatyping

Doc/license.rst

@@ -1139,7 +1139,7 @@ Zstandard bindings
 
 Zstandard bindings in :file:`Modules/_zstd` and :file:`Lib/compression/zstd`
 are based on code from the pyzstd library, copyright Ma Lin and contributors.
-The code is distributed under the 3-Clause BSD License::
+The ``pyzstd`` code is distributed under the 3-Clause BSD License::
 
   Copyright (c) 2020-present, Ma Lin and contributors.
   All rights reserved.