Add some notes about calling functions where the return type can not be deduced.

Regenerate docs.

[SVN r65810]

libs/math

@@ -1 +1 @@
-Subproject commit 0bc7181e617451d21c13b5c08d9eec8a3f328de0
+Subproject commit 115e14a9a637de677256923d8f75e62703ed4b67