Fix whitespace nit in datetime and os rst files.

Doc/library/datetime.rst

@@ -1251,7 +1251,7 @@ Supported operations:
   subtracting their UTC offsets (obtained from ``self.utcoffset()``). In order
   to stop mixed-type comparisons from falling back to the default comparison by
   object address, when a :class:`time` object is compared to an object of a
-  different type, :exc:`TypeError` is raised unless the comparison is ``==`` or 
+  different type, :exc:`TypeError` is raised unless the comparison is ``==`` or
   ``!=``.  The latter cases return :const:`False` or :const:`True`, respectively.
 
 * hash, use as dict key

Doc/library/os.rst

@@ -1339,7 +1339,7 @@ Files and Directories
 
    .. note::
 
-      The exact meaning and resolution of the :attr:`st_atime`, 
+      The exact meaning and resolution of the :attr:`st_atime`,
       :attr:`st_mtime`, and :attr:`st_ctime` attributes depend on the operating
       system and the file system. For example, on Windows systems using the FAT
       or FAT32 file systems, :attr:`st_mtime` has 2-second resolution, and