Clarify init container use case for security #17404
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Fixes #16686
Reasoning: This bullet point has lead to some confusion about how exactly it increases security. I believe it makes more sense to put it at the end of the bullet points list to introduce all concepts first, this makes it a little easier to follow. Second, clarify that running tools in your init containers reduces the attack surface of your application, introducing the clarity of why it makes your app more secure.