[css-viewport-1] Make actual viewport the layout viewport.

Signed-off-by: Shubham Gupta <shubham.gupta@chromium.org>

Author: shubhamg13

css-viewport-1/Overview.bs

@@ -92,7 +92,7 @@ The page area can be set through ''@page'' rules.
 
 This specification introduces a way of overriding the size of the viewport
 provided by the user agent (UA). Because of this, we need to introduce the
-difference between the [=initial viewport=] and the [=actual viewport=].
+difference between the [=initial viewport=] and the [=layout viewport=].
 
 <dl>
 	<dt><dfn>initial viewport</dfn></dt>
@@ -101,23 +101,23 @@ difference between the [=initial viewport=] and the [=actual viewport=].
 		overridden the viewport given by the window or viewing area of the UA.
 		Note that the [=initial viewport=] size will change with the
 		size of the window or viewing area.</dd>
-	<dt><dfn>actual viewport</dfn></dt>
+	<dt><dfn>layout viewport</dfn></dt>
 	<dd>
 		This is the viewport you get after processing the viewport
 		<code>&lt;meta&gt;</code> tag.
 	</dd>
 </dl>
 
-ISSUE: Make [=actual viewport=] the layout viewport, define visual viewport.
+ISSUE: Define visual viewport.
 
-When the [=actual viewport=] cannot fit inside the window or
-viewing area, either because the [=actual viewport=] is
+When the [=layout viewport=] cannot fit inside the window or
+viewing area, either because the [=layout viewport=] is
 larger than the [=initial viewport=] or the zoom factor
-causes only parts of the [=actual viewport=] to be visible,
+causes only parts of the [=layout viewport=] to be visible,
 the UA should offer a scrolling or panning mechanism.
 
 It is recommended that initially the upper-left corners of the
-[=actual viewport=] and the window or viewing area are aligned if the
+[=layout viewport=] and the window or viewing area are aligned if the
 base direction of the document is ltr. Similarly, that the upper-right
 corners are aligned when the base direction is rtl. The base direction
 for a document is defined as the computed value of the 'direction'