[3.14] gh-132983: Add missing references to Zstandard in shutil docstrings (GH-136617) (#137052)

Co-authored-by: Rogdham <3994389+Rogdham@users.noreply.github.com>
Co-authored-by: Zachary Ware <zach@python.org>

Author: 3 people

Lib/shutil.py

@@ -994,14 +994,14 @@ def _make_tarball(base_name, base_dir, compress="gzip", verbose=0, dry_run=0,
     """Create a (possibly compressed) tar file from all the files under
     'base_dir'.
 
-    'compress' must be "gzip" (the default), "bzip2", "xz", or None.
+    'compress' must be "gzip" (the default), "bzip2", "xz", "zst", or None.
 
     'owner' and 'group' can be used to define an owner and a group for the
     archive that is being built. If not provided, the current owner and group
     will be used.
 
     The output tar file will be named 'base_name' +  ".tar", possibly plus
-    the appropriate compression extension (".gz", ".bz2", or ".xz").
+    the appropriate compression extension (".gz", ".bz2", ".xz", or ".zst").
 
     Returns the output filename.
     """
@@ -1187,7 +1187,7 @@ def make_archive(base_name, format, root_dir=None, base_dir=None, verbose=0,
 
     'base_name' is the name of the file to create, minus any format-specific
     extension; 'format' is the archive format: one of "zip", "tar", "gztar",
-    "bztar", "zstdtar", or "xztar".  Or any other registered format.
+    "bztar", "xztar", or "zstdtar".  Or any other registered format.
 
     'root_dir' is a directory that will be the root directory of the
     archive; ie. we typically chdir into 'root_dir' before creating the
@@ -1337,7 +1337,7 @@ def _unpack_zipfile(filename, extract_dir):
         zip.close()
 
 def _unpack_tarfile(filename, extract_dir, *, filter=None):
-    """Unpack tar/tar.gz/tar.bz2/tar.xz `filename` to `extract_dir`
+    """Unpack tar/tar.gz/tar.bz2/tar.xz/tar.zst `filename` to `extract_dir`
     """
     import tarfile  # late import for breaking circular dependency
     try:
@@ -1392,7 +1392,7 @@ def unpack_archive(filename, extract_dir=None, format=None, *, filter=None):
     is unpacked. If not provided, the current working directory is used.
 
     `format` is the archive format: one of "zip", "tar", "gztar", "bztar",
-    or "xztar".  Or any other registered format.  If not provided,
+    "xztar", or "zstdtar".  Or any other registered format.  If not provided,
     unpack_archive will use the filename extension and see if an unpacker
     was registered for that extension.