Documentation should specify default value for repeatEnd.times in group measure

[rpatters1]

It seems like the repeatEnd.times defaults to 2, but it is a bit unclear. Is it only to be used when there are no endings? From the examples that seems to be the case, but again the doc says nothing. It would be helpful if the doc stated:

• the appropriate circumstances under which to provide times.
• the default value if omitted.

It also seems to be tied to a visible representation over the end repeat, so perhaps it is only a visible artifact and has no playback implications. In any case, it would be helpful if there were more explanation of it.