[css-grid-1][css-grid-2] Fix example w3c#11848

Author: fantasai

css-grid-1/Overview.bs

@@ -544,14 +544,14 @@ Sizing the Grid</h3>
 
 	<div class="example">
 		The following example justifies all columns
-		by distributing any extra space among them,
+		by distributing any extra space between them,
 		and centers the grid in the <a>grid container</a>
 		when it is smaller than 100vh.
 
 		<pre>
 			main {
 				display: grid;
-				grid: auto-flow 1fr / repeat(auto-fill, 5em);
+				grid: auto-flow auto / repeat(auto-fill, 5em);
 				min-height: 100vh;
 				justify-content: space-between;
 				align-content: safe center;

css-grid-2/Overview.bs

@@ -544,14 +544,14 @@ Sizing the Grid</h3>
 
 	<div class="example">
 		The following example justifies all columns
-		by distributing any extra space among them,
+		by distributing any extra space between them,
 		and centers the grid in the <a>grid container</a>
 		when it is smaller than 100vh.
 
 		<pre>
 			main {
 				display: grid;
-				grid: auto-flow 1fr / repeat(auto-fill, 5em);
+				grid: auto-flow auto / repeat(auto-fill, 5em);
 				min-height: 100vh;
 				justify-content: space-between;
 				align-content: safe center;