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doc: Document pg_receivewal exit behavior and status

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`@@ -73,6 +73,12 @@ PostgreSQL documentation`
`73`	`73`	`as possible. To avoid this behavior, use the <literal>-n</literal>`
`74`	`74`	`parameter.`
`75`	`75`	`</para>`
	`76`	`+`
	`77`	`+ <para>`
	`78`	`+ In the absence of fatal errors, <application>pg_receivewal</application>`
	`79`	`+ will run until terminated by the <systemitem>SIGINT</systemitem> signal`
	`80`	`+ (<keycombo action="simul"><keycap>Control</><keycap>C</></>).`
	`81`	`+ </para>`
`76`	`82`	`</refsect1>`
`77`	`83`
`78`	`84`	`<refsect1>`
`@@ -348,6 +354,18 @@ PostgreSQL documentation`
`348`	`354`
`349`	`355`	`</refsect1>`
`350`	`356`
	`357`	`+ <refsect1>`
	`358`	`+ <title>Exit Status</title>`
	`359`	`+`
	`360`	`+ <para>`
	`361`	`+ <application>pg_receivewal</application> will exit with status 0 when`
	`362`	`+ terminated by the <systemitem>SIGINT</systemitem> signal. (That is the`
	`363`	`+ normal way to end it. Hence it is not an error.) For fatal errors or`
	`364`	`+ other signals, the exit status will be nonzero.`
	`365`	`+ </para>`
	`366`	`+`
	`367`	`+ </refsect1>`
	`368`	`+`
`351`	`369`	`<refsect1>`
`352`	`370`	`<title>Environment</title>`
`353`	`371`

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