As the request brought to light, there is no mention of the Calendar URL as it relates to communities. The URL is not the same for personal journals as it is for communities--it's ".../users/username" and then ".../community/communityname". So the FAQ should probably be re-worded to somehow make mention of the using the Calendar for communities as well, providing some examples of those URLs too.
On another note, still within FAQ 70, the example URL given in the third paragraph (http://www.livejournal.com/view/?type=month&user=exampleusername) isn't nearly as friendly as the direct URL where you can specify the year/month yourself, such as
And the sentence that says "It is also linked from each of the month blocks on the Calendar page" isn't quite true, unless I'm mis-interpreting it. Clicking the 'view subjects' link on the calendar goes to the "/2004/01" URL, not the "?type=month..." URL.
I don't have any suggestions for a re-write at this time, but will try to come up with something later today. I wanted to make sure to at least post this, though, before I forgot about it entirely, LOL. And someone else will probably have a re-write up quicker than me, anyway. :D