fix valid-until-min typo in sources.list(5)

Git-Dch: Ignore

doc/sources.list.5.xml

@@ -281,7 +281,7 @@ deb-src [ option1=value1 option2=value2 ] uri suite [component1] [component2] [.
 	  </para></listitem>
 
 	  <listitem><para><option>Valid-Until-Min</option>
-		(<option>check-valid-min</option>) and
+		(<option>valid-until-min</option>) and
 		<option>Valid-Until-Max</option>
 		(<option>valid-until-max</option>) can be used to raise or
 		lower the time period in seconds in which the data from this