[css-flexbox] Fix up shorthand definitions

Author: fantasai

css-flexbox/Overview.bs

@@ -1119,6 +1119,13 @@ Flex Direction and Wrap: the 'flex-flow' shorthand</h3>
 	<pre class='propdef shorthand'>
 	Name: flex-flow
 	Value: <'flex-direction'> || <'flex-wrap'>
+	Initial: row nowrap
+	Applies to: <a>flex containers</a>
+	Inherited: no
+	Percentages: n/a
+	Computed value: specified value
+	Media: visual
+	Animation type: discrete
 	</pre>
 
 	The 'flex-flow' property is a shorthand for setting the 'flex-direction' and 'flex-wrap' properties,
@@ -1481,13 +1488,12 @@ Flexibility</h2>
 <h3 id='flex-property'>
 The 'flex' Shorthand</h3>
 
-	<pre class='propdef'>
+	<pre class='propdef shorthand'>
 	Name: flex
 	Value: none | [ <<'flex-grow'>> <<'flex-shrink'>>? || <<'flex-basis'>> ]
-	Initial: see individual properties
+	Initial: 1 0 auto
 	Applies to: <a>flex items</a>
-	Inherited: see individual properties
-	Computed value: see individual properties
+	Inherited: no
 	Media: visual
 	Canonical order: per grammar
 	</pre>