[css-display-3] table grid box -> table box to match CSS2.1 terminology. #1643

Author: fantasai

css-display-3/Overview.bs

@@ -15,7 +15,7 @@ Previous Version: https://www.w3.org/TR/2014/WD-css-display-3-20140911/
 Editor: Tab Atkins Jr., Google, http://xanthir.com/contact/, w3cid 42199
 Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact, w3cid 35400
 Abstract: This module describes how the CSS formatting box tree is generated from the document element tree and defines the 'display' property that controls it.
-Ignored Terms: display-model, display-role, table row group box, absolutely positioned, table formatting context, table grid box
+Ignored Terms: display-model, display-role, table row group box, absolutely positioned, table formatting context
 At Risk: Application of ''::first-letter'' in the presence of run-ins
 At Risk: ''display: run-in''
 At Risk: All multi-keyword values of 'display'
@@ -81,7 +81,7 @@ Introduction</h2>
 	but when the element generates multiple boxes,
 	are sometimes defined to apply to a different box:
 	for example, the 'border' properties applied to a table element
-	are applied to its <a>table grid box</a>,
+	are applied to its <a>table box</a>,
 	not to its <a lt="principal box">principal</a> <a>table wrapper box</a>.
 	If the value computation process alters the styles of those boxes,
 	and the element's style is requested