Wrong code example snippet provided for feature flag naming

[rjstyles]

Documentation Page

Page https://docs.datadoghq.com/real_user_monitoring/guide/setup-feature-flag-data-collection/?tab=browser#feature-flag-naming

Issue Description

The Example provided for replacing the unsupported special characters in feature flag naming is wrong, it doesn't replace all the occurences, should be using String.replaceAll

Suggested edit datadogRum.addFeatureFlagEvaluation(key.replaceAll(':', '_'), value);