[css-ui-3] Fix bikeshed errors

Author: frivoal

css-ui/Overview.bs

@@ -89,7 +89,7 @@ This module describes CSS properties which enable authors
 to style user interface related properties and values.
 
 <a href="https://www.w3.org/TR/REC-CSS1#anchor-pseudo-classes">Section 2.1 of CSS1</a> [[CSS1]]
-and <a href="https://www.w3.org/TR/CSS2/ui.html">Chapter 18 of CSS2</a> [[CSS2]]
+and <a href="https://www.w3.org/TR/CSS2/ui.html">Chapter 18 of CSS2</a> [[CSS21]]
 introduced several user interface related properties and values.
 <a href="https://www.w3.org/TR/2000/WD-css3-userint-20000216">User Interface for CSS3 (16 February 2000)</a> introduced several new user interface related features.
 
@@ -984,7 +984,7 @@ then only the end ellipsis/string should be rendered.
 This property specifies the type of cursor to be displayed for the pointing device
 when the cursor's hotspot is within the element's <a>border edge</a>.
 
-Note: As per [[CSS3-BACKGROUND]], the <a>border edge</a> is affected by 'border-radius'.
+Note: As per [[CSS3BG]], the <a>border edge</a> is affected by 'border-radius'.
 
 In the case of overlapping elements,
 which element determines the type of cursor
@@ -1239,7 +1239,7 @@ Here is an example of using several cursor values.
 </code></pre>
 
 This example sets the cursor on all hyperlinks (whether visited or not)
-to an external <a href="https://www.w3.org/TR/SVG/interact.html#CursorElement">SVG cursor</a> ([[SVG10]], section 16.8.3).
+to an external <a href="https://www.w3.org/TR/SVG/interact.html#CursorElement">SVG cursor</a> ([[SVG]], section 16.8.3).
 User agents that don't support SVG cursors would simply skip
 to the next value and attempt to use the "hyper.cur" cursor.
 If that cursor format was also not supported,