[css-transitions] Explicitly mark definitions of types as such. (No change to generated spec.)

Author: dbaron

css-transitions/Overview.bs

@@ -233,7 +233,7 @@ spec:css-values-3; type:type; text:<time>
       </table>
 
       <div class="prod">
-        <dfn id="single-transition-property">&lt;single-transition-property&gt;</dfn> = all | <<custom-ident>>;
+        <dfn type id="single-transition-property">&lt;single-transition-property&gt;</dfn> = all | <<custom-ident>>;
       </div>
 
       <p>
@@ -543,7 +543,7 @@ spec:css-values-3; type:type; text:<time>
         </tbody>
       </table>
       <div class="prod">
-        <dfn id="single-transition-timing-function">&lt;single-transition-timing-function&gt;</dfn> = ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(<<integer>>[, [ start | end ] ]?) | cubic-bezier(<<number>>, <<number>>, <<number>>, <<number>>)
+        <dfn type id="single-transition-timing-function">&lt;single-transition-timing-function&gt;</dfn> = ease | linear | ease-in | ease-out | ease-in-out | step-start | step-end | steps(<<integer>>[, [ start | end ] ]?) | cubic-bezier(<<number>>, <<number>>, <<number>>, <<number>>)
       </div>
       <p>
         The timing functions have the following definitions.
@@ -782,7 +782,7 @@ spec:css-values-3; type:type; text:<time>
       </table>
 
       <div class="prod">
-        <dfn id="single-transition">&lt;single-transition&gt;</dfn> = [ ''none'' | <<single-transition-property>> ] || <<time>> || <<single-transition-timing-function>> || <<time>>
+        <dfn type id="single-transition">&lt;single-transition&gt;</dfn> = [ ''none'' | <<single-transition-property>> ] || <<time>> || <<single-transition-timing-function>> || <<time>>
       </div>
 
       <p>