[css-text-3] mention the target

Author: fantasai

css-text-3/Overview.bs

@@ -554,7 +554,7 @@ Text Processing</h3>
     Note in particular that 'text-transform' casing operations are lossy,
     and can distort the meaning of a text.
     While accessiblity interfaces may wish to convey
-    the apparent casing of the rendered text,
+    the apparent casing of the rendered text to the user,
     the transformed text cannot be relied on accurately represent
     the underlying meaning of the document.