Fix typos and remove deprecated deprecation warning. (GH-17741)

Doc/library/ctypes.rst

@@ -161,13 +161,6 @@ as the ``NULL`` pointer)::
    0x1d000000
    >>>
 
-.. note::
-
-   :mod:`ctypes` may raise a :exc:`ValueError` after calling the function, if
-   it detects that an invalid number of arguments were passed.  This behavior
-   should not be relied upon.  It is deprecated in 3.6.2, and will be removed
-   in 3.7.
-
 :exc:`ValueError` is raised when you call an ``stdcall`` function with the
 ``cdecl`` calling convention, or vice versa::
 
@@ -624,7 +617,7 @@ Structure/union alignment and byte order
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 By default, Structure and Union fields are aligned in the same way the C
-compiler does it. It is possible to override this behavior be specifying a
+compiler does it. It is possible to override this behavior by specifying a
 :attr:`_pack_` class attribute in the subclass definition. This must be set to a
 positive integer and specifies the maximum alignment for the fields. This is
 what ``#pragma pack(n)`` also does in MSVC.
@@ -922,7 +915,7 @@ attribute later, after the class statement::
    ...                  ("next", POINTER(cell))]
    >>>
 
-Lets try it. We create two instances of ``cell``, and let them point to each
+Let's try it. We create two instances of ``cell``, and let them point to each
 other, and finally follow the pointer chain a few times::
 
    >>> c1 = cell()
@@ -1125,8 +1118,8 @@ hit the ``NULL`` entry::
    >>>
 
 The fact that standard Python has a frozen module and a frozen package
-(indicated by the negative size member) is not well known, it is only used for
-testing. Try it out with ``import __hello__`` for example.
+(indicated by the negative ``size`` member) is not well known, it is only used
+for testing. Try it out with ``import __hello__`` for example.
 
 
 .. _ctypes-surprises: