Docs: fixup typo in os.pwrite docstring

Author: zougloub

Modules/clinic/posixmodule.c.h

@@ -11283,7 +11283,7 @@ os.pwrite -> Py_ssize_t
 Write bytes to a file descriptor starting at a particular offset.
 
 Write buffer to fd, starting at offset bytes from the beginning of
-the file.  Returns the number of bytes writte.  Does not change the
+the file.  Returns the number of bytes written.  Does not change the
 current file offset.
 [clinic start generated code]*/