[css-display-3] Fix Bikeshed complaints

Author: frivoal

css-display-3/Overview.bs

@@ -179,7 +179,7 @@ Box Layout Modes: the 'display' property</h2>
 
 	<div class="advisement">
 		The 'display' property has no effect on an element’s semantics:
-		these are defined by the <a>document language</a> and <em>are not affected by CSS</em>.
+		these are defined by the <a spec=selectors-4>document language</a> and <em>are not affected by CSS</em>.
 		Aside from the ''display/none'' value,
 		which also affects the aural/speech output [[!CSS-SPEECH-1]]
 		and interactivity of an element and its descendants,
@@ -1258,11 +1258,11 @@ Changes</h2>
 		(which is definitely not “as specified”, due to <a>blockification</a> and <a>inlinification</a> rules triggered by various properties).
 		(<a href="https://github.com/w3c/csswg-drafts/issues/1716">Issue 1716</a>)
 	* Added definition for <a>document order</a>.
-	* Added missing SVG elements to <a hrerf="#unbox">Appendix B</a>’s details on ''display: contents''
+	* Added missing SVG elements to <a href="#unbox">Appendix B</a>’s details on ''display: contents''
 		(<a href="https://github.com/w3c/csswg-drafts/issues/2118">Issue 2118</a>)
 		and defined behavior for MathML
 		(<a href="https://github.com/w3c/csswg-drafts/issues/2167">Issue 2167</a>).
-	* Added some <a href="#box-guidance">guidance</a> to future spec authors of anonymous box construction rules.
+	* Added some <a href="#box-guidelines">guidance</a> to future spec authors of anonymous box construction rules.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/1643">Issue 1643</a>)
 	* Pushed the section about “becoming a formatting context” back to <a href="https://www.w3.org/TR/css-contain-1/">CSS Containment</a> where it is used.
 	* Various minor wording fixes and clarifications.