fix(flags): Fix trailing comma in FeatureFlagSnippets

[MaxHorstmann]

Problem

Small frontend documentation bug on Feature flags => "How to implement" => API:

The sample JSON payload contains a trailing comma, which the API rightfully rejects:

$ $ curl https://us.i.posthog.com/decide\?v=3/ \
-X POST -H 'Content-Type: application/json' \
-d '{
    "api_key": "ph...X",
    "distinct_id": "123",
}'

{"type": "validation_error", "code": "malformed_data", "detail": "Malformed request data: Invalid JSON: Expecting property name enclosed in double quotes: line 4 column 1 (char 94)", "attr": null}

Changes

Just updating the snippet so it removes the trailing comma (if there's no group addition).

Does this work well for both Cloud and self-hosted?

Yes

How did you test this code?

Confirmed that the snipped works without the trailing comma:

$ curl https://us.i.posthog.com/decide\?v=3/ \
-X POST -H 'Content-Type: application/json' \
-d '{
    "api_key": "phc...X",
    "distinct_id": "123" 
}'

{"config": {"enable_collect_everything": true}, "toolbarParams": {}, "isAuthenticated": false, "supportedCompression": ["gzip", "gzip-js"], "featureFlags": {"testFeatureFlag": true}, "sessionRecording": false, "captureDeadClicks": false, "capturePerformance": false, "autocapture_opt_out": false, "autocaptureExceptions": false, "analytics": {"endpoint": "/i/v0/e/"}, "elementsChainAsString": true, "surveys": false, "heatmaps": false, "flagsPersistenceDefault": false, "defaultIdentifiedOnly": true, "siteApps": []}

[dmarticus]

nice catch, thank you!