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doc: a follow-up fix for commit 82e1673.

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Original file line number	Diff line number	Diff line change
@@ -843,7 +843,8 @@ The `<time>` argument values are in seconds by default. But it's wise to always
`843`	`843`
`844`	`844`	`This time must be less than 597 hours.`
`845`	`845`
`846`		`-Setting an expire time of 0s will cache the content forever.`
	`846`	`+The semantics of a zero expiration time depends on the actual cache backend storage you are currently using, which is agnostic to this`
	`847`	`+module. In the case of memcached, for example, zero expiration times mean that the item will never expire.`
`847`	`848`
`848`	`849`	This directive was first introduced in the `v0.12rc7` release.
`849`	`850`

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