[Rd] *tiny* inaccuracy in ?dbinom

[Ben Bolker]

   under "Value", ?dbinom says

      If ‘size’ is not an integer, ‘NaN’ is returned.

That should be something like

       If ‘size’ is not an integer, ‘NaN’ is returned (or 'NA' for rbinom).

   ... at least that's what happens for me under svn rev 70138, Ubuntu 14

 > rbinom(1,size=0.5,prob=0.5)
[1] NA
Warning message:
In rbinom(1, size = 0.5, prob = 0.5) : NAs produced
 > dbinom(1,size=0.5,prob=0.5)
[1] NaN
Warning message:
In dbinom(1, size = 0.5, prob = 0.5) : NaNs produced