Adjust label on participants to align to core build

[JonRay15]

The Chore

As you can see here: vegaprotocol/vega#11008

There are some isuses with teh participant count on the games API.

Until these are resolved .. to make it clearer what we're looking at we should chaneg the labels below a bit.

Tasks

• No. of participating teams >>> No. of teams rewarded
• no of partciptaing members >> No. of members rewarded

Additional details / background info

When you do this can you tell me where we get those two fields?? Because on the APIs I'm looking at we shouldnt be successfully distinguishing between the teams vs individual ... but we seem to be ... so I'm intrigued.