Add issue for repeat() joiner.

Author: tabatkins

css-grid/Overview.html

@@ -1041,6 +1041,10 @@ <h4 class="heading settled heading" data-level=5.1.2 id=repeat-notation><span cl
   }
 &lt;/style&gt;</pre>	</div>
 
+	<p class=issue id=issue-476380d2><a class=self-link href=#issue-476380d2></a>
+		François suggests adding an optional third argument with the same syntax as the second,
+		as a joiner between repetitions.
+
 <h4 class="heading settled heading" data-level=5.1.3 id=fr-unit><span class=secno>5.1.3 </span><span class=content>
 Flexible Lengths: the <span class=css data-link-type=maybe title=fr>fr</span> unit</span><a class=self-link href=#fr-unit></a></h4>
 
@@ -3299,6 +3303,10 @@ <h2 class="no-num heading settled" id=issues-index><span class=content>Issues In
 		Ideas welcome, please <a href="mailto:www-style@w3.org?Subject=%5Bcss-grid%5D%20Collapsing%20Grid%20Tracks">post them to www-style@w3.org</a>.
 
 <a href=#issue-8f83c1bc> ↵ </a></div><div class=issue>
+		François suggests adding an optional third argument with the same syntax as the second,
+		as a joiner between repetitions.
+
+<a href=#issue-476380d2> ↵ </a></div><div class=issue>
 		Win8 compat might require the <a class=css-code data-link-for=grid-auto-flow data-link-type=value href=#valuedef-none title=none>none</a> value to stay the initial value,
 		but it’s not a very good value,
 		because by default the entire contents of a grid container will end up stacked on top of each other.

css-grid/Overview.src.html

@@ -946,6 +946,10 @@ <h4 id='repeat-notation'>
 &lt;/style></pre>
 	</div>
 
+	<p class='issue'>
+		François suggests adding an optional third argument with the same syntax as the second,
+		as a joiner between repetitions.
+
 <h4 id='fr-unit'>
 Flexible Lengths: the ''fr'' unit</h4>