[css-pseudo-4] Fix note/issue formatting. Fixes w3c#1261

Author: fantasai

css-pseudo-4/Overview.bs

@@ -485,6 +485,7 @@ Styling Highlights</h3>
   If 'color' is not specified, the text (and text decoration)'s
   unselected color must be used for the highlighted text.
   (As usual, the initial 'background-color' is ''transparent''.)
+
   Issue: Can we reuse ''currentColor'' for this, now that it computes to itself?
 
   The UA should use the OS-default highlight colors
@@ -499,6 +500,7 @@ Styling Highlights</h3>
   The 'color' property specifies the color of both the text
   and all line decorations (underline, overline, line-through)
   applied to the text.
+
   Note: Because 'text-emphasis-color' defaults to ''currrentColor'',
   it will by default also set the color of the the emphasis marks.