[css-anchor-position][editorial] typo

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -172,9 +172,9 @@ for a given positioned element.
 with the ''implicit'' keyword,
 rather than referring to some 'anchor-name' value.
 
-[=Pseudo-element=]
+[=Pseudo-elements=]
 have the same [=implicit anchor element=]
-as its [=originating element=],
+as their [=originating element=],
 unless otherwise specified.
 
 Note: Without this, these [=pseudo-elements=], which are often inaccessible