Update environment-specific-configurations.md

[janrhijn]

Add additional information to add tools:replace="android:label" in order to change the displayname from a flavor

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Name	Status	Preview	Comments	Updated (UTC)
capacitor-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 4, 2024 9:54am

[jcesarmobile]

are you sure you are editing the right AndroidManifest.xml file? You should not need to add tools:replace="android:label" if you are editing the app's AndroidManifest.xml. I've added a placeholder and used the variable and it worked