Update docs

Author: gaogaotiantian

Doc/library/pdb.rst

@@ -188,6 +188,21 @@ slightly different way:
    .. versionadded:: 3.14
       The *commands* argument.
 
+
+.. awaitablefunction:: set_trace_async(*, header=None, commands=None)
+
+   async version of :func:`set_trace`. This function should be used inside an
+   async function with :keyword:`await`.
+
+   .. code-block:: python
+
+      async def f():
+          await pdb.set_trace_async()
+
+   :keyword:`await` statements are supported if the debugger is invoked by this function.
+
+   .. versionadded:: 3.14
+
 .. function:: post_mortem(t=None)
 
    Enter post-mortem debugging of the given exception or