Concatenating transcript results

I propose adding the following sentence to the definition
of SpeechRecognitionAlternative.transcript to make it clear that a
JavaScript author can simply concatenate SpeechRecognitionResults without
the author having to worry about where/when to add whitespace.

"For continuous recognition, whitespace MUST be included in the transcript,
including leading or trailing whitespace, as necessary such that
concatenation of consecutive SpeechRecognitionResults produces a proper
transcript of the session."