[css-text] Add shorthand detail for white-space

Author: fantasai

css-text-4/Overview.bs

@@ -431,7 +431,24 @@ Last Line Minimum Length</h2>
 <h2 id="white-space-property">
 Shorthand for White Space and Wrapping: the 'white-space' property</h2>
 
-	Issue: Diff needs to have the shorthand details
+
+	<pre class="propdef">
+	Name: white-space
+	Value: normal | pre | nowrap | pre-wrap | pre-wrap-auto | pre-line
+	Initial: auto
+	Applies to: all elements
+	Inherited: yes
+	Percentages: n/a
+	Computed value: as specified
+	Media: visual
+	</pre>
+
+	This property is a shorthand for 'text-space-collapse', 'text-wrap', and 'text-space-trim'.
+
+	Note: This shorthand combines both inheritable and non-inheritable properties.
+	If this is a problem, please inform the CSSWG.
+
+	Issue: Add details from level 3
 
 <h2 id="hyphenation">
 Breaking Within Words</h2>