Merge minor changes from Trunk:

Fix Rayleigh distribution range.
Fix gcd argument types.
Update docs to match.

[SVN r63483]

libs/math

@@ -1 +1 @@
-Subproject commit ce9462e9aa5151c920a9c79191cf25e9b61a6e32
+Subproject commit 9be5e2419fd629158b6668dac356946b04fdb872