[css-cascade] Finish half-finished sentence. Fixes #1890.

Author: tabatkins

css-cascade-3/Overview.bs

@@ -340,9 +340,10 @@ Specified Values</h3>
 	In many cases, the <a>specified value</a> is the <a>cascaded value</a>.
 	However, if there is no <a>cascaded value</a> at all,
 	the <a>specified value</a> is <a href="#defaulting">defaulted</a>.
-	The ''initial'' and ''inherit'' keywords
-	are handled specially when they are the <a>cascaded value</a> of a property,
-
+	The [=CSS-wide keywords=] are handled specially
+	when they are the <a>cascaded value</a> of a property,
+	setting the <a>specified value</a> as required by that keyword,
+	see [[#defaulting-keywords]].
 
 <h3 id="computed">
 Computed Values</h3>

css-cascade-4/Overview.bs

@@ -466,9 +466,10 @@ Specified Values</h3>
 	In many cases, the <a>specified value</a> is the <a>cascaded value</a>.
 	However, if there is no <a>cascaded value</a> at all,
 	the <a>specified value</a> is <a href="#defaulting">defaulted</a>.
-	The ''initial'' and ''inherit'' keywords
-	are handled specially when they are the <a>cascaded value</a> of a property,
-
+	The [=CSS-wide keywords=] are handled specially
+	when they are the <a>cascaded value</a> of a property,
+	setting the <a>specified value</a> as required by that keyword,
+	see [[#defaulting-keywords]].
 
 <h3 id="computed">
 Computed Values</h3>