[css-multicol-2] wrapped columsn apply in nested contexts

Fixes w3c#12593

Some clarifications as we’ve resolved that columns can wrap in nested contexts.

Author: rachelandrew

css-multicol-2/Overview.bs

@@ -881,7 +881,7 @@ The number and size of columns</h2>
 		<pre highlight="css">body { column-count: 3 }</pre>
 	</div>
 
-<h3 id='cwr'>The overflow direction in continuous media: the 'column-wrap' property</h3>
+<h3 id='cwr'>The overflow direction: the 'column-wrap' property</h3>
 
 	<pre class=propdef>
 	Name: column-wrap
@@ -895,7 +895,7 @@ The number and size of columns</h2>
 	Animation type: discrete
 	</pre>
 
-	The column-wrap property controls the behavior of overflow columns in continuous media.
+	The column-wrap property controls the behavior of overflow columns.
 	Overflow columns occur when there is more content than will fit in a single row of columns at the specified 'column-height',
 	or inside a height defined by the multicol container.
 
@@ -2188,7 +2188,7 @@ Pagination and Overflow Outside Multicol Containers</h3>
 
 	Columns that appear outside the multicol container in continuous contexts
 	are called <dfn export>overflow columns</dfn>.
-	Overflow columns can affect the height of the multicol container.
+	Overflow columns in the inline direction can affect the height of the multicol container.
 
 	<div class="example">
 		In this example, the height of the multi-column container has been constrained to a maximum height.
@@ -2212,7 +2212,7 @@ Pagination and Overflow Outside Multicol Containers</h3>
 
 	<div class="example">
 
-		In continuous contexts overflow columns can affect the height of the multicol container.
+		In continuous contexts overflow columns in the inline direction can affect the height of the multicol container.
 		In this example a column appears in the overflow which has four lines of text.
 		The multicol container is made tall enough to accommodate this column.