[css-display] Typo: missing parenthesis and dot. (w3c#1662)

Author: Oriol

css-display/Overview.bs

@@ -1142,7 +1142,7 @@ Changes</h2>
 		(<a href="https://drafts.csswg.org/css-display-3/issues-wd-2017#issue-19">Issue 19</a>,
 		<a href="https://drafts.csswg.org/css-display-3/issues-wd-2017#issue-32">Issue 32</a>)
 	* Defined that the root element is “in flow”.
-		(<a href="https://drafts.csswg.org/css-display-3/issues-wd-2017#issue-3">Issue 3</a>
+		(<a href="https://drafts.csswg.org/css-display-3/issues-wd-2017#issue-3">Issue 3</a>)
 	* Defined interaction of ''::first-line''/''::first-letter'' and ''run-in''.
 		(<a href="https://drafts.csswg.org/css-display-3/issues-wd-2017#issue-5">Issue 5</a>,
 		<a href="https://drafts.csswg.org/css-display-3/issues-wd-2017#issue-42">Issue 42</a>)
@@ -1160,7 +1160,7 @@ Changes</h2>
 	* Clarified interaction of various box tree fixups.
 		(<a href="https://drafts.csswg.org/css-display-3/issues-wd-2017#issue-38">Issue 38</a>,
 		<a href="https://drafts.csswg.org/css-display-3/issues-wd-2017#issue-48">Issue 48</a>)
-	* Added the definition of <a>becoming a formatting context</a>
+	* Added the definition of <a>becoming a formatting context</a>.
 	* Miscellaneous minor fixes and minor clarifications.
 
 	A <a href="https://drafts.csswg.org/css-display-3/issues-wd-2017">Disposition of Comments</a> is also available.