[gnumeric] Docs: partially keep up with changes in generated code.

[Morten Welinder <mortenw src gnome org>]

commit b4f108f0f3ff71cad93527c689efc62fb585a52d
Author: Morten Welinder <terra gnome org>
Date:   Fri Jun 28 08:34:36 2013 -0400

    Docs: partially keep up with changes in generated code.

 plugins/fn-r/generate |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/plugins/fn-r/generate b/plugins/fn-r/generate
index 6437495..6ef86cd 100644
--- a/plugins/fn-r/generate
+++ b/plugins/fn-r/generate
@@ -21,7 +21,7 @@ my %defaults;
                  'log_p' => "if true, log of the probability is used",
 
                  'x' => 'observation',
-                 'p' => 'probability',
+                 'p' => 'probability or natural logarithm of the probability',
 
                  'shape' => "the shape parameter $of",
                  'scale' => "the scale parameter $of",
@@ -98,7 +98,8 @@ my %defaults;
     $funcs{'dnbinom'} = $funcs{'pnbinom'} = $funcs{'qnbinom'} =
        [\&distribution,
         'negative binomial',
-        ({ 'n' => 'the number of trials',
+        ({ 'n' => 'required number of successes',
+           'x' => 'observation (number of failures)',
            'psuc' => "the probability of success in each trial",
            @common })];