[3.11] gh-96448: fix documentation for _thread.lock.acquire (GH-96449)

Doc/library/_thread.rst

@@ -157,21 +157,21 @@ This module defines the following constants and functions:
 Lock objects have the following methods:
 
 
-.. method:: lock.acquire(waitflag=1, timeout=-1)
+.. method:: lock.acquire(blocking=True, timeout=-1)
 
  Without any optional argument, this method acquires the lock unconditionally, if
  necessary waiting until it is released by another thread (only one thread at a
  time can acquire a lock --- that's their reason for existence).
 
- If the integer *waitflag* argument is present, the action depends on its
- value: if it is zero, the lock is only acquired if it can be acquired
- immediately without waiting, while if it is nonzero, the lock is acquired
+ If the *blocking* argument is present, the action depends on its
+ value: if it is False, the lock is only acquired if it can be acquired
+ immediately without waiting, while if it is True, the lock is acquired
  unconditionally as above.
 
  If the floating-point *timeout* argument is present and positive, it
  specifies the maximum wait time in seconds before returning. A negative
  *timeout* argument specifies an unbounded wait. You cannot specify
- a *timeout* if *waitflag* is zero.
+ a *timeout* if *blocking* is False.
 
  The return value is ``True`` if the lock is acquired successfully,
  ``False`` if not.