Apply suggestions from code review

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Author: ellaellela

Doc/whatsnew/3.16.rst

@@ -91,7 +91,7 @@ gzip
 ----
 
 * :func:`gzip.open` now accepts an optional argument ``mtime``
-  which is passed on to the init constructor of the GzipFile class.
+  which is passed on to the constructor of the :class:`~gzip.GzipFile` class.
   (Contributed by Marin Misur in :gh:`91372`.)
 
 os

Lib/gzip.py

@@ -65,7 +65,8 @@ def open(filename, mode="rb", compresslevel=_COMPRESS_LEVEL_TRADEOFF,
     if isinstance(filename, (str, bytes, os.PathLike)):
         binary_file = GzipFile(filename, gz_mode, compresslevel, mtime=mtime)
     elif hasattr(filename, "read") or hasattr(filename, "write"):
-        binary_file = GzipFile(None, gz_mode, compresslevel, filename, mtime=mtime)
+        binary_file = GzipFile(None, gz_mode, compresslevel, filename,
+                               mtime=mtime)
     else:
         raise TypeError("filename must be a str or bytes object, or a file")
 

Misc/NEWS.d/next/Library/2022-04-04-17-58-05.bpo-47216.gPyPte.rst

@@ -1,2 +1,2 @@
-Added a mtime option to gzip open().
-open() didn't have it, while init of class GzipFile has mtime as an optional argument.
+Added *mtime* option to :func:`gzip.open`, which will be passed
+to the constructor of :class:`~gzip.GzipFile`.