[css-multicol] Adding Can I Use Panels and a fix

Adding the Can I Use Panels, also fixing the column-gap definition which had been re-added in an unrelated commit. Looks like an error as we resolved to move it to css3-align.

Author: rachelandrew

css-multicol-1/Overview.bs

@@ -19,10 +19,11 @@ Previous Version: https://www.w3.org/TR/2001/WD-css3-multicol-20010118/
 Previous Version: http://www.w3.org/1999/06/WD-css3-multicol-19990623
 Editor: Håkon Wium Lie, Opera Software, howcome@opera.com, w3cid 9796
 Editor: Florian Rivoal, On behalf of Bloomberg, https://florian.rivoal.net, w3cid 43241
-Editor: Rachel Andrew, Fronteers, https://rachelandrew.co.uk, w3cid 81117
+Editor: Rachel Andrew, Invited Expert, https://rachelandrew.co.uk, w3cid 81117
 Issue Tracking: Disposition of Comments https://drafts.csswg.org/css-multicol-1/issues
 Abstract: This specification describes multi-column layouts in CSS, a style sheet language for the web. Using functionality described in the specification, content can be flowed into multiple columns with a gap and a rule between them.
 Link Defaults: css-color (property) color, css2 (property) max-height, css-backgrounds-3 (value) hidden
+Include Can I Use Panels: yes
 </pre>
 
 <pre class="link-defaults">
@@ -761,17 +762,7 @@ Stacking Context</h3>
 
 <h3 id='cg'>Gutters Between Columns: the 'column-gap' property</h3>
 
-	<pre class=propdef>
-	Name: column-gap
-	Value: <<length-percentage [0,&infin;]>> | normal
-	Initial: normal
-	Applies to: <a>multicol containers</a>
-	Inherited: no
-	Percentages: refer to the content width of the multi-column container
-	Computed value: the keyword ''column-gap/normal'' or a computed <<length-percentage>> value
-	Animation type: by computed value type
-	</pre>
-	The 'column-gap' property is defined in [[!CSS3-ALIGN]].
+    The 'column-gap' property is defined in [[!CSS3-ALIGN]].
 
 	In a [=multi-column formatting context=] 
 	the used value of ''normal'' for the 'column-gap' property is ''1em''. 
@@ -795,35 +786,6 @@ Stacking Context</h3>
 	multicol-gap-003.xht
 	</wpt>
 
-	<i>'column-gap' accepting <<length-percentage [0,&infin;]>> is at risk,
-	and may be reverted to <<length [0,&infin;]>>.</i>
-
-	<dl dfn-type=value dfn-for=column-gap>
-		<dt><dfn><<length-percentage [0,&infin;]>></dfn>
-		<dd>
-			Specifies the gap between columns.
-			If there is a column rule between columns,
-			it will appear in the middle of the gap.
-
-			Negative values are not allowed.
-
-			<wpt>
-			multicol-gap-000.xht
-			multicol-gap-002.xht
-			multicol-gap-percentage-001.html
-			</wpt>
-
-		<dt><dfn>normal</dfn>
-		<dd>
-			Identical to <a value for="column-gap">&lt;length-percentage></a>,
-			but with a used value of ''1em''.
-
-			<wpt>
-			multicol-gap-001.xht
-			multicol-gap-003.xht
-			</wpt>
-	</dl>
-
 
 <h3 id='crc'>The Color of Column Rules: the 
 'column-rule-color' property</h3>