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doc: clarify the behavior of unopenable listen_addresses

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Original file line number	Diff line number	Diff line change
`@@ -653,10 +653,15 @@ include_dir 'conf.d'`
`653`	`653`	`<literal>::</literal> allows listening for all IPv6 addresses.`
`654`	`654`	`If the list is empty, the server does not listen on any IP interface`
`655`	`655`	`at all, in which case only Unix-domain sockets can be used to connect`
`656`		`- to it.`
	`656`	`+ to it. If the list is not empty, the server will start if it`
	`657`	`+ can listen on at least one TCP/IP address. A warning will be`
	`658`	`+ emitted for any TCP/IP address which cannot be opened.`
`657`	`659`	`The default value is <systemitem class="systemname">localhost</systemitem>,`
`658`	`660`	`which allows only local TCP/IP <quote>loopback</quote> connections to be`
`659`		`- made. While client authentication (<xref`
	`661`	`+ made.`
	`662`	`+ </para>`
	`663`	`+ <para>`
	`664`	`+ While client authentication (<xref`
`660`	`665`	`linkend="client-authentication"/>) allows fine-grained control`
`661`	`666`	`over who can access the server, <varname>listen_addresses</varname>`
`662`	`667`	`controls which interfaces accept connection attempts, which`

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