[Rd] typo in qpois help (PR#13583)

[manikandan_narayanan at merck.com]

Full_Name: Manikandan Narayanan
Version: 2.8.1
OS: Linux
Submission from: (NULL) (155.91.45.231)


Here is an excerpt from qpois help page (?qpois): 

     The quantile is left continuous: 'qgeom(q, prob)' is the largest
     integer x such that P(X <= x) < q.

  I think the "qgeom" here should be "qpois" instead. Please correct this typo
in ?qpois, since it's misleading in its current form. 

Thanks!