[css-page-floats] simplify position of anchor description

Author: johanneswilm

css-page-floats/Overview.bs

@@ -60,8 +60,8 @@ Terminology</h2>
     <dt><dfn>Float anchor</dfn>
     <dd>
       The float anchor is the point in the flow where the float had appeared had
-      it not been a float and instead had been a zero-width and zero-height
-      inline element with no margins, borders or padding.
+      it not been a float and instead had been an empty inline element with no
+      margins, borders or padding.
     <dt><dfn>Float containing block formatting context</dfn>
     <dd>
       The block formatting context inside of which the float is embedded.