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Add a note that checking for flash messages defeats HTTP cacheability

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Original file line number	Diff line number	Diff line change
@@ -265,6 +265,13 @@ It's common to use ``notice``, ``warning`` and ``error`` as the keys of the
`265`	`265`	`different types of flash messages, but you can use any key that fits your`
`266`	`266`	`needs.`
`267`	`267`
	`268`	`+..tip::`
	`269`	`+`
	`270`	`+ Accessing flash messages means that the session must be started, which`
	`271`	+ in turn will cause Symfony to mark the responses as ``private``. In general,
	`272`	`+ since flashes shall displayed only once, pages that might display flashes`
	`273`	`+ cannot reasonably be cached in HTTP caches.`
	`274`	`+`
`268`	`275`	`Configuration`
`269`	`276`	`-------------`
`270`	`277`

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