[css-overflow-3][editorial] Capitalization/punctuation/paragraphing fixes.

Author: fantasai

css-overflow-3/Overview.bs

@@ -206,13 +206,13 @@ Scrollable Overflow</h3>
 	The <a>scrollable overflow area</a> is the union of:
 	<ul>
 		<li>
-			the box’s own [=padding box=]
+			The [=scroll container=]’s own [=padding box=].
 
 		<li>
-			all line boxes directly contained by the box
+			All [=line boxes=] directly contained by the [=scroll container=].
 
 		<li>
-			the border boxes
+			The border boxes
 			of all boxes for which it is the containing block
 			and whose border boxes are positioned not wholly outside
 			its <a>block-start</a> or <a>inline-start</a> padding edges,
@@ -224,7 +224,7 @@ Scrollable Overflow</h3>
 			sufficiently accurate?
 
 		<li>
-			the <a>scrollable overflow areas</a> of all of the above boxes
+			The <a>scrollable overflow areas</a> of all of the above boxes
 			(accounting for transforms as described above),
 			provided they themselves have ''overflow: visible''
 			(i.e. do not themselves trap the overflow)
@@ -269,8 +269,9 @@ Scrollable Overflow</h3>
 			<!-- Make sure http://jsbin.com/qececaqilo/edit?html,css,output is clearly defined. -->
 
 		<li>
-			the margin areas of <a>grid item</a> and <a>flex item</a> boxes
+			The margin areas of <a>grid item</a> and <a>flex item</a> boxes
 			for which the box establishes a containing block.
+
 			The UA may <em>additionally</em> include
 			the margin areas of other boxes
 			for which the box establishes a containing block;