Documentation update for tasklet.throw

[akruis]

Output of help(stackless.tasklet.throw) is:

Help on method_descriptor:

throw(...)
    tasklet.throw(exc, val=None, tb=None, immediate=True) -- raise an exception for the tasklet.
    'exc', 'val' and 'tb' have the same semantics as the 'raise' statement of the Python(r) language.
    If 'pending' is True, the tasklet is not immediately activated, just
    merely made runnable, ready to raise the exception when run.

the 4th argument has been changed from immediate=True to pending=False a long time ago (75f4d17). Trivial to fix.

[akruis]

it's fixed.