[css-position-3][editorial] bikeshed fixes

Author: tabatkins

css-position-3/Overview.bs

@@ -20,6 +20,11 @@ spec:css-writing-modes-4; type:dfn; text:end
 spec:css2; type:value; for:float; text:none
 spec:css-align-3; type:value; for:align-self; text:center
 spec:css2; type:dfn; text:stacking context
+spec:css-backgrounds-3; type:property;
+	text:border-left-width
+	text:border-right-width
+	text:border-top-width
+	text:border-bottom-width
 </pre>
 
 <style type="text/css">
@@ -383,7 +388,7 @@ with earlier steps modifying the containing block
 that later steps see:
 
 1. If the [=containing block=] is generated by a [=grid container=],
-	the [=grid positioning properties=]
+	the [=grid-placement properties=]
 	on the positioned element
 	change the [=containing block=]
 	to the corresponding [=grid area=]
@@ -1803,11 +1808,14 @@ Acknowledgments</h2>
 		<li>Rewrote the whole spec for editorial clarity, technical precision, and compatibility with [[CSS-ALIGN-3]], [[CSS-WRITING-MODES-3]], [[CSS-BREAK-3]], and [[CSS-DISPLAY-3]].
 	</ul>
 
-<h2 class=no-num id=priv-sec>
-Privacy and Security Considerations</h2>
+<h2 class=no-num id=privacy>
+Privacy Considerations</h2>
 
 This specification introduces no new privacy considerations.
 
+<h2 class=no-num id=security>
+Security Considerations</h2>
+
 If an attacker is able to inject arbitrary CSS,
 positioned layout can make it easier to position elements the attacker has control of
 over arbitrary other elements of the page,