[css-grid-1] Fix the range that <positive-integer> was supposed to be replaced with.

Author: tabatkins

css-grid-1/Overview.bs

@@ -1685,7 +1685,7 @@ Syntax of ''repeat()''</h5>
 	The generic form of the ''repeat()'' syntax is, approximately,
 
 	<pre class='prod'>
-		repeat( [ <<integer [0,&infin;]>> | auto-fill | auto-fit ] , <<track-list>> )
+		repeat( [ <<integer [1,Infinity]>> | auto-fill | auto-fit ] , <<track-list>> )
 	</pre>
 
 	The first argument specifies the number of repetitions.
@@ -1703,9 +1703,9 @@ Syntax of ''repeat()''</h5>
 	has several forms:
 
 	<pre class='prod'>
-		<dfn><<track-repeat>></dfn> = repeat( [ <<integer [0,&infin;]>> ] , [ <<line-names>>? <<track-size>> ]+ <<line-names>>? )
+		<dfn><<track-repeat>></dfn> = repeat( [ <<integer [1, Infinity]>> ] , [ <<line-names>>? <<track-size>> ]+ <<line-names>>? )
 		<dfn><<auto-repeat>></dfn>  = repeat( [ auto-fill | auto-fit ] , [ <<line-names>>? <<fixed-size>> ]+ <<line-names>>? )
-		<dfn><<fixed-repeat>></dfn> = repeat( [ <<integer [0,&infin;]>> ] , [ <<line-names>>? <<fixed-size>> ]+ <<line-names>>? )
+		<dfn><<fixed-repeat>></dfn> = repeat( [ <<integer [1, Infinity]>> ] , [ <<line-names>>? <<fixed-size>> ]+ <<line-names>>? )
 	</pre>
 
 	* The <<track-repeat>> variant can represent the repetition of any <<track-size>>,