Update spec.

test/spec.txt

@@ -1,8 +1,8 @@
 ---
 title: CommonMark Spec
 author: John MacFarlane
-version: 0.26
-date: '2016-07-15'
+version: 0.27
+date: '2016-11-18'
 license: '[CC-BY-SA 4.0](http://creativecommons.org/licenses/by-sa/4.0/)'
 ...
 
@@ -3637,11 +3637,11 @@ The following rules define [list items]:
     If the list item is ordered, then it is also assigned a start
     number, based on the ordered list marker.
 
-    Exceptions: When the list item interrupts a paragraph---that
-    is, when it starts on a line that would otherwise count as
-    [paragraph continuation text]---then (a) the lines *Ls* must
-    not begin with a blank line, and (b) if the list item is
-    ordered, the start number must be 1.
+    Exceptions: When the first list item in a [list] interrupts
+    a paragraph---that is, when it starts on a line that would
+    otherwise count as [paragraph continuation text]---then (a)
+    the lines *Ls* must not begin with a blank line, and (b) if
+    the list item is ordered, the start number must be 1.
 
 For example, let *Ls* be the lines