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