Unify ZoneInfo.from_file signatures

Author: hrimov

Lib/zoneinfo/_zoneinfo.py

@@ -75,12 +75,12 @@ def _new_instance(cls, key):
         return obj
 
     @classmethod
-    def from_file(cls, fobj, /, key=None):
+    def from_file(cls, file_obj, /, key=None):
         obj = super().__new__(cls)
         obj._key = key
         obj._file_path = None
-        obj._load_file(fobj)
-        obj._file_repr = repr(fobj)
+        obj._load_file(file_obj)
+        obj._file_repr = repr(file_obj)
 
         # Disable pickling for objects created from files
         obj.__reduce__ = obj._file_reduce