website: update docs for new functions

website/source/docs/templates/configuration-templates.html.markdown

@@ -55,6 +55,8 @@ While some configuration settings have local variables specific to only that
 configuration, a set of functions are available globally for use in _any string_
 in Packer templates. These are listed below for reference.
 
+* `build_name` - The name of the build being run.
+* `build_type` - The type of the builder being used currently.
 * `isotime [FORMAT]` - UTC time, which can be [formatted](http://golang.org/pkg/time/#example_Time_Format).
    See more examples below.
 * `lower` - Lowercases the string.