Update activities.md

[ezio416]

remark on active param

[codecat]

Should we say:

Therefore, if you would like to see all enabled [..]

To make it a bit clearer?

[davidbmaier]

I just tested it, and I think the original assumption is incorrect (or has changed since the first iteration of this page was written) - I can just omit the active parameter, and I get all activities (active and inactive).

So instead of these proposed changes, we should make the parameter optional and explain that omitting it means you'll get both enabled and disabled activities (as long as you're a club admin, otherwise you just get an error because you need to restrict it to active ones).

I made those changes in your branch @ezio416, but I'll keep this PR open for you to have a look as well in case I missed something.

[ezio416]

Thank you, I had not tried omitting the param and had gotten myself confused while trying to get activities for my own club and getting none. I think your change is worded nicely and clearly