Correct gammavariate's method name and domain.
Partial solution to SF bug 527139.
diff --git a/Doc/lib/librandom.tex b/Doc/lib/librandom.tex
index bff9a76..47fea4f 100644
--- a/Doc/lib/librandom.tex
+++ b/Doc/lib/librandom.tex
@@ -216,9 +216,9 @@
positive infinity.
\end{funcdesc}
-\begin{funcdesc}{gamma}{alpha, beta}
+\begin{funcdesc}{gammavariate}{alpha, beta}
Gamma distribution. (\emph{Not} the gamma function!) Conditions on
- the parameters are \code{\var{alpha} > -1} and \code{\var{beta} > 0}.
+ the parameters are \code{\var{alpha} >= 0.5} and \code{\var{beta} > 0}.
\end{funcdesc}
\begin{funcdesc}{gauss}{mu, sigma}