Remove documentation to non-existent function PyObject_CopyToObject (fixes #11478)

diff --cc Doc/c-api/buffer.rst
index e4c32093e201462c8acb06088aa263f303f24d94,094f7f2239fa41dd2f39aab5c02191e9a3d06698..5a34bc09eef7e3458066c63c10c80601509eff02
--- 1/Doc/c-api/buffer.rst
--- 2/Doc/c-api/buffer.rst
+++ b/Doc/c-api/buffer.rst
@@@ -298,27 -300,13 +298,13 @@@ Buffer-related function
     longer being used as it may free memory from it.
  
  
 -.. cfunction:: Py_ssize_t PyBuffer_SizeFromFormat(const char *)
 +.. c:function:: Py_ssize_t PyBuffer_SizeFromFormat(const char *)
  
 -   Return the implied :cdata:`~Py_buffer.itemsize` from the struct-stype
 -   :cdata:`~Py_buffer.format`.
 +   Return the implied :c:data:`~Py_buffer.itemsize` from the struct-stype
 +   :c:data:`~Py_buffer.format`.
  
  
- .. c:function:: int PyObject_CopyToObject(PyObject *obj, void *buf, Py_ssize_t len, char fortran)
- 
-    Copy *len* bytes of data pointed to by the contiguous chunk of memory
-    pointed to by *buf* into the buffer exported by obj.  The buffer must of
-    course be writable.  Return 0 on success and return -1 and raise an error
-    on failure.  If the object does not have a writable buffer, then an error
-    is raised.  If *fortran* is ``'F'``, then if the object is
-    multi-dimensional, then the data will be copied into the array in
-    Fortran-style (first dimension varies the fastest).  If *fortran* is
-    ``'C'``, then the data will be copied into the array in C-style (last
-    dimension varies the fastest).  If *fortran* is ``'A'``, then it does not
-    matter and the copy will be made in whatever way is more efficient.
- 
- 
 -.. cfunction:: int PyBuffer_IsContiguous(Py_buffer *view, char fortran)
 +.. c:function:: int PyBuffer_IsContiguous(Py_buffer *view, char fortran)
  
     Return 1 if the memory defined by the *view* is C-style (*fortran* is
     ``'C'``) or Fortran-style (*fortran* is ``'F'``) contiguous or either one