[css-grid-3] Link to issues

css-grid-3/Overview.bs

@@ -547,6 +547,8 @@ Masonry Track Specification</h3>
 	(and their shorthands)
 	apply in the [=grid axis=] of the [=masonry container=]
 	and establish tracks just as on regular [=grid containers=].
+
+	ISSUE(10869): What should be the initial track listing?
 </section>
 
 <section class="option masonry">
@@ -577,6 +579,8 @@ Masonry Track Specification</h3>
 	or otherwise filling the [=masonry container=]
 	with as many ''grid-template-columns/auto'' tracks as possible.)
 
+	ISSUE(10869): What should be the initial value?
+
 	<pre class=propdef>
 	Name: masonry-template-areas
 	Value: none | <<string>>
@@ -730,6 +734,8 @@ repeat(auto-areas)</h3>
 
 	Note: This value applies both to regular [=grid containers=] and to [=masonry containers=].
 
+	ISSUE(10854): It's unclear if we actually need this value.
+
 <h4 id="repeat-auto-fit">
 repeat(auto-fit)</h3>