Update broadcast grouping descriptions and example

[tors42]

"grouping.info.tours" is not a comma separated list but a linebreak separated list.

Add description to "grouping.scoreGroups" to hint that it is a repeatable parameter with index, i.e
'grouping.scoreGroups[0]=wYigbpXq,M5YHvpOX'

curl,bash,jq "reproducer"

LICHESS="http://localhost:8080"
TOKEN="lip_yulia"

A1=$(curl -s $LICHESS/broadcast/new \
    --data-urlencode "name=Type A | Day 1" \
    --request POST \
    --header "Content-Type: application/x-www-form-urlencoded" \
    --header "Authorization: Bearer $TOKEN" \
    | jq -r .tour.id)

A2=$(curl -s $LICHESS/broadcast/new \
    --data-urlencode "name=Type A | Day 2" \
    --request POST \
    --header "Content-Type: application/x-www-form-urlencoded" \
    --header "Authorization: Bearer $TOKEN" \
    | jq -r .tour.id)

B1=$(curl -s $LICHESS/broadcast/new \
    --data-urlencode "name=Type B | Day 1" \
    --request POST \
    --header "Content-Type: application/x-www-form-urlencoded" \
    --header "Authorization: Bearer $TOKEN" \
    | jq -r .tour.id)

B2=$(curl -s $LICHESS/broadcast/new \
    --data-urlencode "name=Type B | Day 2" \
    --request POST \
    --header "Content-Type: application/x-www-form-urlencoded" \
    --header "Authorization: Bearer $TOKEN" \
    | jq -r .tour.id)

echo $LICHESS/broadcast/$A1/edit

curl $LICHESS/broadcast/$A1/edit \
    --request POST \
    --header "Content-Type: application/x-www-form-urlencoded" \
    --header "Authorization: Bearer $TOKEN" \
    --data-urlencode "name=Type A | Day 1" \
    --data-urlencode "grouping.info.name=The Group" \
    --data-urlencode "grouping.info.tours=$A1,$A2,$B1,$B2" \
    --data-urlencode "grouping.scoreGroups[0]=$A1,$A2" \
    --data-urlencode "grouping.scoreGroups[1]=$B1,$B2"

{"error":{"grouping.info.tours":["Invalid value: Xh0y1Dir,YBSOXETw,zgy0bByU,XIQICt1Z"]}}

curl $LICHESS/broadcast/$A1/edit \
    --request POST \
    --header "Content-Type: application/x-www-form-urlencoded" \
    --header "Authorization: Bearer $TOKEN" \
    --data-urlencode "name=Type A | Day 1" \
    --data-urlencode "grouping.info.name=The Group" \
    --data-urlencode "grouping.info.tours=$A1"$'\n'"$A2"$'\n'"$B1"$'\n'"$B2" \
    --data-urlencode "grouping.scoreGroups[0]=$A1,$A2" \
    --data-urlencode "grouping.scoreGroups[1]=$B1,$B2"

{"ok":true}