[#343] Extend testsuites for PATCH method

Signed-off-by: Kirill Sosnovskikh <k.sosnovskikh@yadro.com>

src/frostfs_testlib/cli/frostfs_cli/object.py

@@ -315,8 +315,9 @@ class FrostfsCliObject(CliCommand):
             ttl: TTL value in request meta header (default 2)
             wallet: WIF (NEP-2) string or path to the wallet or binary key
             xhdr: Dict with request X-Headers
+
         Returns:
-            (str): ID of patched Object
+            Command's result.
         """
         return self._execute(
             "object patch",